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1 “10·09”海澱區冷西偉被殺案經典案例評析

“10·09”海澱區冷西偉被殺案經典案例評析

大包王朝编者按：

洗地难度这么高，王局还乐此不疲，我也是醉了。

那么多真傻子还是假傻子，还在假装他不是大外宣？

就以这个案例来说吧，这个案例已经替胡鑫宇案洗地的最好案例，

这个案例中，嫌疑人把关键物证血衣，扔在现场周围的屋顶，

警察都没有找到，嫌疑人杀人前藏身在受害人床底下，

警察也没勘察。

这已经是替胡鑫宇洗地的最好例子。

但是，BUG出在哪里？这个案子警察破案了！

也就是警察的动机是什么？正常情况下自然是千方百计破案。

但是，还有一种也不少见的情况，就是警察收了黑钱。

那就是相反，千方百计掩盖。

这就是结果论，警察破案有一百种方法。

破案的过程中犯了低级错误不要紧，关键是要破案。

现实中的中国警察，高度依赖技侦或网侦手段破案，也就是手机定位。

要么就是口供，

警察没找到关键物证，警察不知道嫌疑人藏身何处，这样作案的细节。

但是只要把嫌疑人抓来，一问就知道了。

所以，最大的疑点就是警察没有破案。

警察本来已经通知胡鑫宇家属结案了，结果又来了这么一出。

也就是本来已经是cold case，无法破案了。

单纯从刑事技术上很难把这个案子圆过来

王局还要和胡叼盘一样硬洗。

《北京犯罪報告9: 海淀》

【案例摘要】

2011年10月9日，北京市海澱區林業大學學研中心建築工地發生一起殺人案，工地項目書記兼生產經理冷西偉被殺死在工地臨建辦公室內。案件發生在名牌大學校區工地，各級領導高度重視。刑偵總隊、海澱分局會同技偵、網安、情報等相關部門，連續奮戰十六晝夜，通過細緻的調查摸底和影像追蹤等工作最終鎖定嫌疑人，一舉破獲此案。

專案組指揮員：刑偵總隊一支隊政委樊宏宇、一支隊四中隊中隊長宋樹勇、七支隊政委張勇、副支隊長鐘濤、七支隊痕跡室主任劉英傑、八大隊大隊長劉力、副大隊長劉華、DNA室主任焦章平、海澱刑偵支隊支隊長吳振江、副支隊長孫愛軍、重案隊中隊長崔鵬

專案組參戰人員：刑偵總隊一支隊偵查員李佳、何偉、王冰洲、高亮、薑承言、張新鵬

七支隊技術人員孟欣

八大隊法醫李長榮

一、案發情況

據發現人杜煥宇（男，41歲，中國天津市南開區人，工地專案經理）反映：2011年10月9日8時許，杜發現死者冷西偉（男，37歲，戶籍地：中國河北省唐山市豐潤區，工作單位：中國建築二局第三建築工程有限公司）未到崗上班。遂撥打其手機，發現對方關機。11時許，杜找到工地消防保衛部部員工李旋（男，27歲，中國河北省唐山市人）一同前往冷西偉的房間查看。李旋持備用鑰匙打開房間外門，待李推開里間房門（未鎖）後，發現冷西偉身上有血，已經死亡，遂報警。

二、死者基本情況

冷西偉，男，37歲，1974年7月18日出生，戶籍地：中國河北省唐山市豐潤區，身份證號：，現住址：北京市大興區黃村中裡時代龍和社區31-2-1301，手機號：13146276080。工作單位：中國建築二局第三建築工程有限公司。

冷西偉作為林業大學學研中心的項目生產經理及書記，主要工作職責有：保衛管理，勞務糾紛，食堂後勤，標牌製作，安全消防，協調政府部門，處理擾民問題。

據冷西偉親屬、同事反映：冷西偉性格外向，為人本分，家庭和睦。平時生活簡樸、隨意，經濟條件一般。日常交往人員比較複雜。

三、現場勘查與法醫檢驗情況

（一）現場勘查情況

現場位於北京市海澱區林業大學學研中心教學樓建築工地。中心現場位於工地北側臨建辦公樓的一層西數第3間房間內。房門朝南，門上掛有“專案書記”的門牌。門鎖完好，門鎖嚴密性較差，經技術試驗可用塑膠卡片打開。室內結構為裡外套間，東側外間為辦公室，西側里間為臥室。死者頭西腳東左側臥位於臥室西北角的單人床（床頭向西）南側地面上。全身僅穿著一條紅色內褲，雙腿夾壓有一條藍格圖案棉被，雙足底部可見沾染血跡。單人床上可見大量血跡。在室內地面上可見成趟可疑血足跡，長約29.5釐米。死者附近牆面、臥室門上均可見大量甩濺血跡。地面上可見大量滴落血。另在死者頭部附近牆面可見帶血紡織物的擦蹭痕跡。在死者頭部附近紙箱上、臥室東側衣櫃上、辦公室北側老闆台抽屜上等處提取到帶血的觸摸痕跡，室內有翻動痕跡。另在屋外展板與空調室外機之間地面上發現一趟由西向東的立體足跡，與室內地面上的灰塵足跡、血足跡相同。

經對現場可疑血足跡進行分析，初步推斷為旅遊鞋類足跡，鞋約八成新。犯罪嫌疑人可能系一名青年男性，身高在1.70米至1.77米之間，具有盜竊經驗。

經對死者物品進行清點發現：死者左手無名指佩戴的金屬戒指以及隨身攜帶的1部黑色三星牌直板手機（型號為S5830 ，號碼為13146276080）、1張公交IC卡、3000元左右現金被搶。

（二）法醫檢驗情況

經法醫初步檢驗，死者系男性，屍長約170釐米。頭面部可見3處破創，顱骨發現1處月牙形刺創，刺穿顱骨，創口寬度約0.3釐米。左腋下可見1處刺創，從左胸到右胸貫穿心肺，創道長約26釐米。軀幹部可見13處刺創傷，其中背部11處。通過檢驗，發現創口及創道內含有微量的鐵、鋅元素，成傷工具前端應能形成月牙形創口。分析死因系急性失血性休克死亡，死亡時間在2011年10月9日2時許。

後偵查員在現場工地發現一種前段磨尖的管狀工具。該工具系施工人員將鍍鋅管一端用打磨機按一定傾斜度磨成斜尖狀，類似管叉，常用于木工鑿孔作業。經法醫研究分析認為，該種工具可以形成死者身上創傷。

四、調查訪問情況

據死者同事曹治國（男，32歲，中國河北省唐山市豐潤區人）、賈珍龍（男，32歲，北京市密雲縣人）、魏欣（男，29歲，中國河北省唐山區豐潤區人）、徐潮（男，21歲，北京市大興區人）等人反映：2011年10月8日18時許，冷西偉和曹治國、賈珍龍、王大道（男，41歲，中國湖北省竹溪縣人）前往林業大學附近雙清路一家名為“皖魚”的飯館用餐。期間四人均有飲酒，21時30分許，四人返回工地。曹治國獨自返回自己房間，賈珍龍、王大道和冷西偉回到冷的辦公室繼續聊天。22時許賈、王二人一同離開。冷來到隔壁辦公室與魏欣、徐潮、萬東方（男，45歲，中國江蘇省常州市金壇市人）、郝欣（男，33歲，北京市西城區人）四人聊天。23時30分許，冷返回自己房間休息，魏等四人前往工地驗收檢查工程。10月9日0時30分許，魏、徐再次返回辦公室。後徐先離開辦公室返回宿舍，魏于1時30分許離開辦公室返回宿舍，未發現異常情況。

五、案情分析及下一步工作部署

綜合上述情況，專案組初步分析該案系一起具有侵財性質的故意殺人案件。犯罪嫌疑人應為男性，犯罪嫌疑人對現場工地有一定的瞭解，極可能具有在建築工地工作的經歷。鑒於此，特制定工作如下：

（一）技術、法醫工作

1、由技術部門對現場進行複勘，對提取的痕跡物證進行檢驗，研究確定嫌疑人進門方式，同時開展現場週邊勘查及搜索。

2、由法醫中心對提取的生物檢材進行檢驗，對血跡分佈進行再研究。

（二）物證調查工作

查找與可疑血足跡同種的鞋樣。

（三）內部排查工作

對現場所在工地務工人員進行逐一排查。

（四）調取監控工作

調取現場及周邊地區監控錄影，注意發現可疑情況。

（五）技偵工作

由十二總隊對死者通訊資訊開展相關工作。

六、技術偵察工作

經技偵工作，發現：冷西偉丟失的手機於2011年10月9日1時40分許信號位置位於現場附近。2時40分許關機，此時信號位置移動到西北側區域，含靜淑苑路北側和部門工地民工生活區。

七、監控錄影情況

經查，現場周邊地區共有監控探頭14個。其中工地南門1個，其餘分佈在工地周邊路口路段。

經查看，發現：2011年10月9日2時30分許，在靜淑苑路，一頭戴黃色安全帽的人員自南向北行走，通過林大14號院門口探頭，走向關機區域，行跡十分可疑。在他通過該監控探頭時，另有一年輕男子在他身前進入林大14號院院門。

經對林大14號院住戶進行走訪，偵查員找到監控中的年輕男子張興東（男，19歲，中國遼寧省葫蘆島市人）。據該人反映：10月9日2時許，他自北京宏達四方上網服務中心（海澱區清華東路25號電子研究所後樓三層）離開，準備返回暫住地（即林大14號院）休息。在行至靜淑苑路（距離南口100米）處時，聽見背後有異常響動。他回頭看時發現一頭戴黃色安全帽民工打扮的男子（身高約1.7米，體態較瘦，小眼睛）在路西側快步走。張分析該男子有可能自路西側的工地內翻出工地的圍擋，後該男子向北走去。

八、工地內部排查

案發工地占地面積約為8200平方米，工程承辦方系中國建築二局第三建築工程有限公司。2011年1月18日該專案開工，2011年3月底各個施工隊開始進駐，預計2013年3月10日完工。

經查，工地專案部現有經理部、技術部、安全部等9個部門，共計員工52人。其中保安隊共有11名隊員。其中8人負責在工地現場看守西南兩門、日常巡邏及衛生打掃。另外3人負責生活區的安全保衛。施工方現有金壇金銘隊等9支施工隊。上述單位中居住在工地北側民工生活區的人員共計645人。

專案組一方面組織上述專案部、施工方單位負責人對監控錄影中的戴黃色安全帽的男子進行辨認。另一方面對600餘人進行逐一排查，重點關注以下幾類人員：

（一）時間可疑

案發當晚值班人員。

案發當天監控錄影中進入工地，但未監控發現離開的人員。

案發後（10月9日當天）上班遲到、請假的人員。

案發後無故離開的人員。

（二）言語行為可疑人員

案發前曾打磨過管插類工具的人員。

案發後突然花錢闊綽的人員。

案發後當晚洗澡、洗衣的人員。

案發後丟棄過衣物、鞋的人員。

案發後積極打聽案情的人員。

曾經流露出對工地領導不滿，特別是與死者冷西偉有矛盾糾紛的人員。

（三）其他可疑的人員

身上、衣物、物品上有疑似血跡的人員。

案發後持有與被搶手機、金戒指的人員。

案發後情緒異常的人員。

近期身上有傷的人員。

九、破案經過

（一）線索來源

專案組結合監控錄影、工地加班表及人員間的相互印證，重點對10月8日、9日兩天在工地加班的人員進行定時定位，發現：該工地信號工周賢曾於2011年10月8日17時44分進入工地後，未發現他出工地的監控影像。

經訪問他的工友得知：周賢于8日17時許在工地加班，但自22時許後就無人看到他工作，也無人知道他何時出工地返回生活區。直至9日3時許，同宿舍工友發現周賢回到宿舍。當時他頭髮濕漉，可能洗過澡。且案發後，周賢曾請工友一起去歌廳消費，花錢較大方。

據此，專案組對周賢進行訪問，周稱：8日晚一直與工友一起在工地加班，一同回到宿舍，且言語間神色慌張。綜合各種情況，專案組確定周賢有重大作案嫌疑。

2011年10月25日19時30分，偵查人員在北京市海澱區林業大學學研中心教學樓建築工地生活區內將犯罪嫌疑人周賢（男，16歲，中國雲南人）抓獲。

（二）犯罪嫌疑人基本情況

周賢，男，16歲，漢族，小學文化,戶籍地：中國雲南省大理白族自治州巍山彝族回族自治縣，現為江蘇金銘建築勞務公司駐林業大學學研中心教學樓建築工地信號工，住工地生活區。

（三）嫌疑人供述情況

經審訊，犯罪嫌疑人周賢初步供述：他曾因工作失誤及違反工地紀律被死者訓斥。遂懷恨在心，伺機殺害死者洩憤。並事先準備手套、水電管（一端斜切為尖頭）和鋼筋棍（一端磨尖）。10月8日23時許，他趁死者前往隔壁屋裡聊天之際潛入死者房間躲藏在臥室床下。待死者返回屋內睡熟後，從床下爬出，先行至死者外屋電腦桌前，看到電腦時間為“1時45分”。後他戴上手套，左手持水電管，右手持鋼筋棍至死者床前，持鋼筋棍捅向死者的頸部，死者驚醒。二人發生打鬥，期間，周賢多次持水電管紮死者後背及腹部，直至死者倒地身亡。周為製造搶劫殺人假像，翻動死者老闆台抽屜、衣櫃、衣兜等，竊得死者的戒指、4700元現金及一部黑色直板手機。後他將門反鎖後從工地東牆翻出，返回生活區，並將作案時所穿衣物、作案工具及死者的手機、戒指丟棄。

後來專案組在該工地生活區北側的草叢中找到周賢作案用的水電管1支，在生活區南側屋頂上找到其作案所穿的淺綠色長袖T恤。

十、案例評析

（一）成功之處

技術勘查方面：勘查方法得當，判斷準確，堅持案件不破、勘查不止

1、現場勘查方法得當。在現場室內外均提取到嫌疑人灰塵足跡，在室內提取到往返嫌疑血足跡。為分析作案過程、認定嫌疑人打下良好基礎。

2、現場出入道、出入方式分析細緻。根據現場環境及房門情況，排除了暴力入室的方式，判斷出嫌疑人具有利用插卡開門或溜道方式潛入室內的可能性，為確定熟人作案提供了一定依據。

3、對翻動部位勘查細緻。現場物品有翻動情況，且死者的金戒指、大額現金、手機均丟失，說明嫌疑人翻動較為細緻，具有一定侵財意圖。根據被翻動的物品擺放較為整齊的情況，判斷嫌疑人有翻動了物品後復位的生活習慣，有效的刻畫了嫌疑人心理動機。

4、對殺人過程分析準確。根據入室方式、室內照明的開關情況等確定嫌疑人有事先預謀、熟悉環境，且殺人動機明確，為偵查工作提供有力支援。

5、全程跟案。現場未發現除可疑足跡外的重要痕跡，且嫌疑人有可能系戴手套作案。為進一步發現有價值痕跡物證，邀請刑事技術專家進行複勘。同時按照專案組確定的偵查方向，積極配合偵查員的摸排工作，對工地圍牆、宿舍區等地進行勘查，切實做到了案件不破、勘查不止。

法醫檢驗方面：檢驗精細，分析準確，廣辟工作思路及方法

法醫中心通過細緻核對總和實地勘驗，首先，迅速確定了致傷工具為案發工地工人所用的金屬管叉類工具，縮小了偵查範圍，為專案組圍繞案發工地工人開展摸排工作提供有力依據。其次，準確確定死亡時間，為專案組部署的監控錄影查看工作及排查工作奠定良好基礎。三是開創性的對靜電吸附膜上微量進行DNA檢驗，並獲得成功。

案件偵查方面：領導重視，組織得當，摸排與監控影像相結合，抓捕和審訊有預案，最終成功破案

1、各級領導高度重視，部署精准。市局局長傅政華多次叮問案件進展情況，副局長姜良棟每天聽取工作情況並作出部署。要求專案組案件不破，每天都要再勘查再研究，保障了全體參戰人員認識不斷深入，信心越來越堅定。總隊副總隊長隗甫傑多次踏勘現場及周邊地區，大力組織內部排查，保證了正確的偵查方向。全體同志方向明確，一直將工地600余人作為重點，堅定執行專案組的決策。

2、摸排工作組織得當，內部分工明確，互相協作，層層負責。針對案發工地人員的摸排工作，專案組領導親自講方法，設計表格，擬定摸排提綱，總結出摸排的十項重點內容。結合現場缺乏認定人身證據的特點，制定摸清“五個號碼”（即身份證號、手機號、QQ號、鞋號、公交卡號）等，進行動態排查的工作要點.同時採用定時定位的傳統排查方法，直接獲取了嫌疑人10月8日晚不在崗的多名證人證言。

3、影像追蹤持之以恆。正確劃定影像追蹤區域，研究出正確的觀看方法，及時引進、使用進口篩查軟體，堅信嫌疑人一定在監控中會留下蹤跡。經過連續十五天的觀看，嫌疑人終於被發現。

4、抓捕、審查工作準備充分，行動果斷，信心強，方法好。確定嫌疑人後，全體人員統一思想，集體研究方案，選准突破點，利用其弱點，一舉獲得突審成功。

（二）不足之處

勘查有失全面，搜索範圍有局限性

1、勘查不全面。犯罪嫌疑人供述曾在被害人進入現場前躲藏在臥室床下，但技術人員卻忽略了對現場死者床下的勘查，錯失獲得進一步痕跡物證的良機。

2、週邊搜索工作不力。專案組將案發工地內及民工宿舍區作為排查重點，同時部署了周邊地區的搜查工作。但技術人員未能在上述地點發現贓證物或有價值線索。後經犯罪嫌疑人指認，專案組在宿舍區附近民房房頂上發現血衣，在宿舍區與林大之間的垃圾堆裡發現作案工具及手機，這說明勘查認識不到位，搜索不細緻。

總結傷檢經驗，加強對非特異性傷口的分析和研究

嫌疑人供述使用2種不同的工具襲擊、殺害死者，而非最初判斷的一種成傷工具。這說明對屍體傷檢，尤其是對非特異性傷口的分析研究還有待加強，應繼續總結實踐經驗，提高檢驗水準。

摸排、訪問工作缺乏細緻、深入

由於工作量大，偵查中也暴露出一些問題。尤其是偵查員對排查工作有畏難情緒，在對600餘人的排查中，因警力不足等原因，將逐人定時定位演變成集中登記，致使可疑情況沒有及時摸上來。另一方面，現場訪問工作也沒有深入。在對工頭和管理層的訪問中，沒有將嫌疑人受到死者處罰和案後去歌廳消費、超市購物等情況訪問出來，致使矛盾、反常點沒有凸顯。

四、專案工作要求

此案的破獲是傳統偵查方法與現代科技綜合運用的又一成功範例，充分展現了刑偵系統頑強拼搏的精神和攻堅克難的能力。同時，通過這一考驗刑偵基本功的案件，也反射出一些問題，鑒於此，在以後的專案偵查中要注意以下三個方面問題：

（一）嚴格落實現場勘查規範。

在全域推行命案現場勘查人員穿著防護裝制度。勘查人員一律穿著一次性勘查服，戴帽、戴口罩、穿著鞋套，保護現場各類痕跡物證，尤其是生物檢材，提高DNA的提取率和檢出率。

（二）強化偵查、技術、法醫資訊溝通機制。

技術、法醫、偵查三個部門要積極主動交流、溝通，建立成熟的資訊溝通機制，互相瞭解工作進程，隨時通報工作進展及結果。堅持做到案件不破，勘查不止，檢驗不停。

（三）推進“一體化”偵查模式。

偵查、技術、法醫、情報、網安、技偵、督查等部門要全程跟案。專案組根據案情、參戰人員數量、部門、工作等情況劃分各個作戰單元，確定每個作戰單元的負責人及工作職責。隨時總結工作進展情況進行彙報明確職責，互相配合，協同作戰，全面實現“一體化”偵查模式。

刑偵總隊一支隊

二〇一二年七月五日

“10.09” classic case analysis of the murder of Leng Xiwei in Haidian District

Dabao Dynasty Editor’s Note:

The difficulty of cleaning the floor is so high, Wang Ju is still enjoying it, and I am also drunk.

So many real fools or fake fools, still pretending that he is not a big propaganda?

Let’s take this case as an example. This case has been the best case to clear the ground for the Hu Xinyu case.

In this case, the suspect threw key evidence and bloody clothes on the roofs around the scene,

The police did not find it. The suspect hid under the victim’s bed before the murder.

The police did not investigate either.

This is already the best example of washing the ground for Hu Xinyu.

But where is the bug? The police solved the case!

That is, what is the motive of the police? Under normal circumstances, it is natural to do everything possible to solve the case.

However, there is another situation that is not uncommon, that is, the police collect black money.

That is the opposite, doing everything possible to cover up.

This is the theory of consequence. There are a hundred ways for the police to solve a case.

It doesn’t matter if you make low-level mistakes in the process of solving the case, the key is to solve the case.

In reality, the Chinese police rely heavily on technical investigation or online investigation to solve cases, that is, mobile phone location.

or a confession,

The police did not find key physical evidence, and the police did not know where the suspect was hiding, such details of the crime.

But as long as the suspect is caught, he will know as soon as he asks.

Therefore, the biggest doubt is that the police did not solve the case.

The police had already informed Hu Xinyu’s family to close the case, but this happened again.

That is to say, it is already a cold case and cannot be solved.

It is difficult to round up this case purely from criminal technology

The king’s game has to be washed as hard as Hu Diaopan.

related books

“Beijing Crime Report 9: Haidian”

【Case summary】

On October 9, 2011, a homicide occurred at the construction site of the Research Center of Forestry University in Haidian District, Beijing. Leng Xiwei, the project secretary and production manager of the construction site, was killed in the temporary construction office of the construction site. The case occurred at the construction site of a famous university campus, and leaders at all levels attached great importance to it. The Criminal Investigation Corps, Haidian Sub-bureau, together with technical investigation, network security, intelligence and other relevant departments, fought continuously for 16 days and nights, and finally identified the suspect through meticulous investigation and video tracking, and solved the case in one fell swoop.

Commanders of the special case team: Fan Hongyu, political commissar of the first team of the Criminal Investigation Corps, Song Shuyong, the leader of the fourth squadron of the first team, Zhang Yong, the political commissar of the seventh team, Zhong Tao, the deputy leader, Liu Yingjie, the director of the trace room of the seventh team, Liu Li, the captain of the eighth team, and Liu Liu, the deputy team leader Hua, Jiao Zhangping, Director of the DNA Office, Wu Zhenjiang, Head of the Haidian Criminal Investigation Detachment, Sun Aijun, Deputy Head of the Criminal Investigation Detachment, Cui Peng, Squadron Leader of the Serious Crime Squad

Participating personnel of the special case team: Investigators Li Jia, He Wei, Wang Bingzhou, Gao Liang, Jiang Chengyan, Zhang Xinpeng, investigators of the first team of the Criminal Investigation Corps

Meng Xin, technician of Team Seven

Forensic Doctor Li Changrong of the Eighth Team

1. The circumstances of the incident

According to the discoverer Du Huanyu (male, 41 years old, from Nankai District, Tianjin City, China, construction site project manager): At 8:00 on October 9, 2011, Du found the deceased Leng Xiwei (male, 37 years old, place of residence: Hebei, China) Fengrun District, Tangshan City, Province, work unit: China Construction Second Bureau Third Construction Engineering Co., Ltd.) did not arrive for work. Then he called his mobile phone and found that the other party was turned off. At about 11 o’clock, Du found Li Xuan (male, 27 years old, from Tangshan City, Hebei Province, China), an employee of the construction site’s fire protection department, and went to Leng Xiwei’s room to check. Li Xuan opened the outer door of the room with a spare key. After Li pushed open the inner door (unlocked), he found that Leng Xiwei was dead with blood on his body, so he called the police.

2. Basic situation of the deceased

Leng Xiwei, male, 37 years old, born on July 18, 1974, household registration: Fengrun District, Tangshan City, Hebei Province, China, ID number: , current address: 31-2, Shidailonghe Community, Zhongli, Huangcun, Daxing District, Beijing -1301, mobile phone number: 13146276080. Employer: China Construction Second Bureau Third Construction Engineering Co., Ltd.

As the project production manager and secretary of the Research Center of Forestry University, Leng Xiwei’s main responsibilities include: security management, labor disputes, canteen logistics, sign making, fire safety, coordination with government departments, and dealing with disturbance issues.

According to Leng Xiwei’s relatives and colleagues: Leng Xiwei is extroverted, responsible, and has a harmonious family. Life is simple and casual, and the economic conditions are average. Daily contacts with people are more complicated.

3. On-site investigation and forensic examination

(1) On-site investigation

The site is located at the construction site of the teaching building of the Learning and Research Center of Forestry University, Haidian District, Beijing. The center site is located in the third room from the west on the first floor of the temporary office building on the north side of the construction site. The door of the room faces south, and the number plate of “Project Secretary” is hung on the door. The door lock is in good condition, but the tightness of the door lock is poor. After technical tests, it can be opened with a plastic card. The interior structure is the inner and outer rooms, the outer room on the east side is the office, and the inner room on the west side is the bedroom. The deceased was lying on the south side of the single bed (the head of the bed facing west) in the northwest corner of the bedroom, with his head on the west, feet on the east and left side lying on the ground. He was wearing only a pair of red underwear all over his body, and a quilt with a blue grid pattern was pressed between his legs, and blood stains were visible on the bottom of his feet. There was a lot of blood on the single bed. Suspicious blood footprints, about 29.5 centimeters in length, can be seen on the indoor floor. A large number of blood spatters can be seen on the wall near the deceased and on the bedroom door. Blood dripped profusely on the ground. In addition, traces of rubbing of bloody textiles can be seen on the wall near the head of the deceased. Bloody touch marks were found on the carton near the head of the deceased, on the wardrobe on the east side of the bedroom, and on the drawer of the boss desk on the north side of the office, and there were traces of flipping in the room. In addition, a three-dimensional footprint from west to east was found on the ground between the outdoor display board and the outdoor unit of the air conditioner, which is the same as the dust footprint and blood footprint on the indoor ground.

After analyzing the suspicious blood footprints at the scene, it was preliminarily deduced that they were footprints of tourist shoes, and the shoes were about 80% new. The suspect may be a young male, between 1.70 meters and 1.77 meters tall, with experience in theft.

After an inventory of the deceased’s belongings, it was found that the metal ring worn by the deceased’s left ring finger, a black Samsung brand straight mobile phone (model S5830, number 13146276080), a bus IC card, and about 3,000 yuan in cash were robbed.

(2) Forensic medical examination

Preliminary forensic examination revealed that the deceased was a male with a body length of about 170 centimeters. Three wounds were seen on the head and face, and one crescent-shaped stab wound was found on the skull, piercing the skull, and the width of the wound was about 0.3 cm. A stabbing wound was seen in the left armpit, which ran through the heart and lungs from the left chest to the right chest, and the length of the wound was about 26 cm. There were 13 stab wounds on the trunk, including 11 on the back. Through inspection, it was found that the wound and the wound path contained trace amounts of iron and zinc elements, and the front end of the wounding tool should be able to form a crescent-shaped wound. The cause of death was analyzed as acute hemorrhagic shock, and the time of death was around 2:00 on October 9, 2011.

Later investigators found a tubular tool with a sharpened front section at the construction site. The tool is used by construction personnel to grind one end of the galvanized pipe into a pointed shape with a grinder at a certain inclination, similar to a pipe fork, and is often used in woodworking drilling operations. According to forensic research and analysis, this kind of tool can cause trauma on the body of the deceased.

4. Survey visits

According to the deceased’s colleagues Cao Zhiguo (male, 32 years old, from Fengrun District, Tangshan City, Hebei Province, China), Jia Zhenlong (male, 32 years old, from Miyun County, Beijing), Wei Xin (male, 29 years old, from Fengrun District, Tangshan City, Hebei Province, China People), Xu Chao (male, 21 years old, from Daxing District, Beijing) and others reported: At 18:00 on October 8, 2011, Leng Xiwei, Cao Zhiguo, Jia Zhenlong, Wang Dao (male, 41 years old, Hubei, China People from Zhuxi County, Zhejiang Province) went to a restaurant named “Wanyu” in Shuangqing Road near Forestry University for dinner. During the period, all four of them drank alcohol. At about 21:30, the four of them returned to the construction site. Cao Zhiguo returned to his room alone, while Jia Zhenlong, Wang Daodao and Leng Xiwei returned to Leng’s office to continue chatting. At 22:00 Xu Jia and Wang left together. Leng came to the office next door to chat with Wei Xin, Xu Chao, Wan Dongfang (male, 45 years old, from Jintan City, Changzhou City, Jiangsu Province, China), and Hao Xin (male, 33 years old, from Xicheng District, Beijing). At about 23:30, Leng returned to his room to rest, and four people including Wei went to the construction site to accept and inspect the project. At about 0:30 on October 9, Wei and Xu returned to the office again. Later, Xu left the office and returned to the dormitory. Wei left the office and returned to the dormitory at about 1:30. No abnormalities were found.

V. Case Analysis and Next Step Work Deployment

Based on the above circumstances, the special case team initially analyzed that the case was a case of intentional homicide with property infringement. The suspect should be a male. The suspect has a certain understanding of the construction site and is likely to have the experience of working on a construction site. In view of this, the special work is as follows:

(1) Technical and forensic work

1. The technical department will re-survey the scene, inspect the traces and evidence extracted, study and determine the way the suspect entered the door, and carry out surveys and searches around the scene at the same time.

2. The forensic center will examine the extracted biological samples and re-study the bloodstain distribution.

(2) Physical evidence investigation work

Find a shoe sample of the same species as the suspicious blood trail.

(3) Internal investigation work

Conduct a one-by-one investigation of the migrant workers on the site.

(4) Calling for monitoring work

Retrieve the surveillance video of the scene and the surrounding area, and pay attention to any suspicious situations.

(5) Technical investigation work

The Twelfth Corps will carry out related work on the communication information of the deceased.

6. Technical reconnaissance work

After technical investigation, it was found that the signal position of Leng Xiwei’s lost mobile phone was located near the scene at about 1:40 on October 9, 2011. At about 2:40, it was turned off. At this time, the signal position moved to the northwest area, including the north side of Jingshuyuan Road and the living area of migrant workers on some construction sites.

7. Surveillance Video Situation

After investigation, there were 14 monitoring probes in the surrounding area of the scene. Among them, there is one at the south gate of the construction site, and the rest are distributed at the intersections around the construction site.

After inspection, it was found that at about 2:30 on October 9, 2011, on Jingshuyuan Road, a person wearing a yellow helmet walked from south to north, passed the probe at the gate of No. 14 courtyard of Linda University, and walked towards the shutdown area. The whereabouts are very suspicious. When he passed the surveillance camera, another young man entered the courtyard gate of No. 14 Linda University in front of him.

After interviewing the residents of Linda No. 14 Courtyard, investigators found the young man Zhang Xingdong (male, 19 years old, from Huludao City, Liaoning Province, China) who was under surveillance. According to the person’s report: at around 2 o’clock on October 9, he left from Beijing Hongda Sifang Internet Service Center (the third floor of the back building of the Institute of Electronics, No. 25 Qinghua East Road, Haidian District) and was about to return to his temporary residence (that is, Linda No. 14 Courtyard) )rest. When walking to Jingshuyuan Road (100 meters from the south exit), I heard abnormal noises behind me. When he looked back, he saw a man (about 1.7 meters tall, thinner, with small eyes) dressed as a migrant worker in a yellow hard hat walking quickly on the west side of the road. Zhang analyzed that the man might turn inside out from the construction site on the west side of the road, and then the man walked northward.

8. Internal inspection of the construction site

The site where the incident occurred covers an area of about 8,200 square meters, and the contractor of the project is the Third Construction Engineering Co., Ltd. of China Construction Second Bureau. The project started on January 18, 2011, and various construction teams began to move in at the end of March 2011. It is expected to be completed on March 10, 2013.

After investigation, the construction site project department currently has 9 departments including the manager department, technology department, and safety department, with a total of 52 employees. The security team has 11 members. Among them, 8 people are responsible for guarding the two southwest gates, daily patrols and sanitation cleaning on the construction site. The other three are responsible for the security of the living quarters. The construction party currently has 9 construction teams including the Jintan Jinming Team. There are a total of 645 people living in the living area of migrant workers on the north side of the construction site among the above-mentioned units.

On the one hand, the special case team organized the above-mentioned project department and the person in charge of the construction unit to identify the man wearing the yellow hard hat in the surveillance video. On the other hand, more than 600 people were investigated one by one, focusing on the following types of personnel:

(1) Time is suspicious

The staff on duty the night of the incident.

On the day of the incident, the surveillance video entered the construction site, but the personnel who left were not monitored.

After the incident (October 9th), those who were late for work and asked for leave.

People who left without reason after the incident.

(2) Persons with suspicious speech behavior

The personnel who had polished the intubation tools before the incident.

A person who spends money suddenly after the incident.

The personnel who took a bath and did laundry on the night after the incident.

People who discarded clothes and shoes after the incident.

Those who actively inquired about the case after the incident occurred.

He once expressed dissatisfaction with the leaders of the construction site, especially those who had conflicts with the deceased Leng Xiwei.

(3) Other suspicious persons

People with suspected bloodstains on their bodies, clothing, and objects.

After the incident, the person who held the robbed mobile phone and gold ring.

People who are emotionally abnormal after the incident.

People with recent injuries.

Nine, the process of solving the case

(1) Sources of clues

Combining surveillance video, construction site overtime schedule and mutual verification among personnel, the special task force focused on the regular positioning of the personnel who worked overtime on the construction site on October 8 and 9. After entering the construction site at 17:44, no surveillance video of him leaving the construction site was found.

The workers who interviewed him learned that: Zhou Xian worked overtime at the construction site at around 17:00 on the 8th, but no one saw him working after 22:00, and no one knew when he left the construction site and returned to the living area. Until 3 o’clock on the 9th, the co-workers in the same dormitory discovered that Zhou Xian had returned to the dormitory. His hair was wet and he may have taken a shower. And after the incident, Zhou Xian once invited his workers to go to the karaoke bar for consumption, and the money was relatively generous.

Based on this, the task force interviewed Zhou Xian. Zhou said: On the evening of the 8th, he had been working overtime on the construction site with his co-workers, and returned to the dormitory together, with a flustered look while speaking. Based on various circumstances, the task force determined that Zhou Xian was suspected of committing a major crime.

At 19:30 on October 25, 2011, investigators arrested the suspect Zhou Xian (male, 16 years old, from Yunnan, China) in the living area of the construction site of the teaching building of the Forestry University Research Center in Haidian District, Beijing.

(2) Basic information of the criminal suspect

Zhou Xian, male, 16 years old, Han nationality, elementary school education, registered residence: Weishan Yi and Hui Autonomous County, Dali Bai Autonomous Prefecture, Yunnan Province, China, is currently a signal worker at the construction site of the teaching building of the Learning and Research Center of the Forestry University of Jiangsu Jinming Construction Labor Service Company, and lives on the construction site Living Area.

(3) Confessions of the suspect

After interrogation, the criminal suspect Zhou Xian made a preliminary statement: he was reprimanded by the deceased for his work mistakes and violation of construction site discipline. So he held a grudge and waited for an opportunity to kill the deceased to vent his anger. And prepare gloves, water and electricity pipes (one end beveled to a pointed end) and steel bar (one end sharpened). At about 23:00 on October 8, he sneaked into the room of the deceased and hid under the bed in the bedroom while the deceased was chatting in the next room. After the deceased returned to the house and fell asleep, he crawled out from under the bed, went to the computer desk in the outside room of the deceased, and saw that the computer time was “1:45”. Finally, he put on gloves, held the water pipe in his left hand, and the steel bar in his right hand, and went to the bed of the deceased, and stabbed the dead man’s neck with the steel bar, causing the deceased to wake up. There was a fight between the two, during which Zhou Xian repeatedly stabbed the victim’s back and abdomen with a water hose until the deceased fell to the ground and died. Zhou Wei created the illusion of robbery and murder by flipping through drawers, wardrobes, and pockets of the deceased’s boss desk, and stole the deceased’s ring, 4,700 yuan in cash, and a black straight cell phone. Afterwards, he locked the door, turned out from the east wall of the construction site, returned to the living area, and discarded the clothes, tools, mobile phones and rings of the deceased when he committed the crime.

Later, the task force found a water and electricity pipe used by Zhou Xian in the grass on the north side of the living area of the construction site, and found the light green long-sleeved T-shirt he was wearing in the crime on the roof of the south side of the living area.

10. Case analysis

(1) Success

In terms of technical investigation: the investigation method is appropriate, the judgment is accurate, the case is not solved, and the investigation does not stop

1. Appropriate on-site investigation method. The suspect’s dust footprints were extracted both indoors and outdoors at the scene, and the suspect’s blood footprints were extracted indoors. It lays a good foundation for analyzing the process of committing crimes and identifying suspects.

2. Detailed analysis of on-site access and access methods. According to the scene environment and the condition of the door, the method of violent entry was ruled out, and it was judged that the suspect had the possibility of using a card to open the door or slip into the room, which provided a certain basis for determining the crime committed by acquaintances.

3. Carefully investigate the flipped parts. The items at the scene were turned over, and the deceased’s gold ring, large amount of cash, and mobile phone were all lost, indicating that the suspect’s turned over was more detailed and had a certain intention of trespassing. According to the tidy arrangement of the flipped objects, it is judged that the suspect has a habit of resetting after flipping the objects, which effectively portrays the suspect’s psychological motivation.

4. Accurate analysis of the killing process. According to the way of entering the room, the switch of the indoor lighting, etc., it is determined that the suspect has premeditated, is familiar with the environment, and has a clear motive for killing, which provides strong support for the investigation work.

5. Follow up the case throughout the process. No important traces other than suspicious footprints were found at the scene, and the suspect may have committed the crime wearing gloves. In order to further discover valuable traces and physical evidence, criminal technology experts are invited to conduct re-examination. At the same time, in accordance with the investigation direction determined by the task force, actively cooperate with the investigation work of the investigators, conduct investigations on the construction site walls, dormitory areas and other places, and effectively ensure that the case is not solved and the investigation continues.

Forensic inspection: fine inspection, accurate analysis, extensive work ideas and methods

Through detailed checks and on-site inspections, the Forensic Medicine Center quickly determined that the injury tool was a metal pipe fork tool used by workers on the site where the case occurred, narrowing the scope of the investigation and providing a strong basis for the task force to carry out investigations around the workers on the site where the case occurred. Secondly, the accurate determination of the time of death lays a good foundation for the surveillance video review and investigation work deployed by the task force. The third is the pioneering test of DNA on a small amount on the electrostatic adsorption film, and it has been successful.

In terms of case investigation: the leadership attaches great importance to it, properly organizes it, combines investigation and surveillance images, has a plan for arrest and interrogation, and finally successfully solves the case

1. Leaders at all levels attach great importance to it and make precise deployments. Fu Zhenghua, the director of the Municipal Bureau, repeatedly asked about the progress of the case, and Jiang Liangdong, the deputy director, listened to the work situation every day and made arrangements. It is required that the case of the special case team should not be solved, and that the investigation and research should be carried out every day, so as to ensure that the understanding of all combatants will continue to deepen and their confidence will become more and more firm. Kui Fujie, the deputy head of the corps, visited the scene and surrounding areas many times, and vigorously organized internal investigations to ensure the correct direction of investigation. All comrades have a clear direction, have always focused on more than 600 people on the construction site, and firmly implemented the decision-making of the task force.

2. Proper organization of the survey work, clear internal division of labor, mutual cooperation, and responsibility at all levels. Aiming at the investigation work of the personnel on the construction site where the case occurred, the leader of the special case team personally explained the method, designed the form, drew up the outline of the investigation, and summarized ten key contents of the investigation. Combined with the lack of identification of personal evidence at the scene, formulate the work points for finding out the “five numbers” (i.e. ID number, mobile phone number, QQ number, shoe number, bus card number), etc., for dynamic investigation. At the same time, the traditional method of regular positioning is adopted The investigation method directly obtained the testimony of multiple witnesses who were not on duty on the evening of October 8.

3. Persistence in image tracking. Correctly delineate the image tracking area, study the correct viewing method, introduce and use imported screening software in a timely manner, and firmly believe that the suspect will definitely leave traces in the surveillance. After fifteen consecutive days of watching, the suspect was finally discovered.

4. Sufficient preparations for arrest and review work, decisive action, strong confidence, and good methods. After the suspect was identified, all the staff unified their thinking, collectively studied the plan, selected the breakthrough point, took advantage of its weakness, and succeeded in the sudden trial in one fell swoop.

(2) Deficiencies

The survey is not comprehensive and the search scope is limited

1. The survey is not comprehensive. The suspect confessed that he hid under the bed in the bedroom before the victim entered the scene, but the technicians ignored the investigation under the bed of the deceased at the scene and missed the opportunity to obtain further traces and physical evidence.

2. The surrounding search work is weak. The special case team focused on the investigation site and the migrant workers’ dormitory area, and deployed searches in the surrounding areas at the same time. However, technicians failed to find stolen evidence or valuable clues at the above-mentioned locations. After being identified by the criminal suspect, the task force found bloody clothes on the roof of the houses near the dormitory area, and found criminal tools and mobile phones in the garbage dump between the dormitory area and Linda University.

Summarize the experience of wound examination and strengthen the analysis and research of non-specific wounds

The suspect confessed to using two different tools to attack and kill the deceased, rather than the initial judgment of a wounding tool. This shows that the analysis and research on cadaveric wounds, especially non-specific wounds, needs to be strengthened, and practical experience should be summed up to improve the inspection level.

The investigation and interview work lacked meticulousness and in-depth

Due to the heavy workload, some problems were exposed during the investigation. In particular, the investigators were afraid of the difficulty of the investigation. During the investigation of more than 600 people, due to insufficient police force and other reasons, the fixed-time positioning of each person turned into a centralized registration, resulting in suspicious situations not being detected in time. On the other hand, the work of on-site visits is not in-depth. During the interviews with the foreman and management, the suspects were not punished by the deceased and went to karaoke clubs and supermarkets to shop after the case. As a result, the contradictions and abnormalities were not highlighted.

4. Project work requirements

The cracking of this case is another successful example of the comprehensive application of traditional investigation methods and modern technology, fully demonstrating the tenacious spirit and ability of the criminal investigation system to overcome difficulties. At the same time, passing this case, which tested the basic skills of criminal investigation, also reflected some problems. In view of this, the following three aspects should be paid attention to in the future special case investigation:

(1) Strictly implement the on-site survey specifications.

A system for homicide scene investigators to wear protective clothing has been implemented across the region. Investigators are all wearing disposable survey suits, hats, masks, and shoe covers to protect all kinds of traces and evidence at the scene, especially biological inspection materials, so as to improve the extraction rate and detection rate of DNA.

(2) Strengthen investigation, technology, and forensic information communication mechanisms.

The three departments of technology, forensic medicine, and investigation must actively communicate and communicate, establish a mature information communication mechanism, understand each other’s work progress, and report work progress and results at any time. Adhere to the fact that the case is not solved, the investigation is not stopped, and the inspection is not stopped.

(3) Promoting the “integrated” investigation model.

Investigation, technology, forensic, intelligence, network security, technical investigation, supervision and other departments must follow the case throughout the process. The task force divides each combat unit according to the case, the number of combatants, departments, work, etc., and determines the person in charge and job responsibilities of each combat unit. Summarize the progress of the work at any time and report to clarify responsibilities, cooperate with each other, and coordinate operations to fully realize the “integrated” investigation mode.

Criminal investigation team

July 5, 2012

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