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命案积案多年未告破 警方从7枚烟头找到关键信息

2017-05-06 04:36:15   法制日报

随即,检验技术员把目光瞄向了在离中心现场150多米外发现的几枚烟头。烟头虽是检出率相对较高的检材,但案发时间已过去近17年,并不确定是否有残留DNA。但DNA技术人员还是对烟头进行了反复实验。

经过繁琐细致的检验比对,技术人员在7枚烟头中检出多个男性基因分型,其中两个基因分型在DNA数据库比中了李某兵和刘某生。

但这几枚烟头与中心现场仍有一定距离,需要确证烟头与中心现场的关系,才能最终锁定嫌疑人。民警再次梳理现场物证,反复试验,发现中心现场提取的头套检材中的基因分型与其中一枚烟头检出的基因分型一致。

这一结果说明在外围现场抽烟的一人可能戴头套到过现场或者说作案人员极有可能是聚集在外围现场抽烟的其中一人。

DNA比对出嫌疑人

专案组根据DNA比中前科人员的线索,对此案进行深挖细查,先后在广东省深圳市、四川省南充市、湖南省郴州市等地展开侦查工作。民警3次往返四川省南充市,于今年2月16日抓获犯罪嫌疑人李某兵。

提取李某兵的血样检验后发现,其DNA分型与对应烟头的分型一致。为进一步印证,办案人员将李某兵的掌纹与案发中心现场提取的手印进行比对,结果两者吻合,由此确认李某兵是作案团伙成员之一。

而同案人员刘某生因涉嫌抢劫案件于今年1月被广东省东莞市警方抓获。经检验,刘某生的DNA分型与对应烟头的分型一致。

面对证据,李某兵、刘某生对当年伙同他人在梅县松口入室抢劫的事实供认不讳,并交代了同案嫌疑人陈某华和绰号“春破皮”的男子。

今年3月,办案民警到南充市营山县调查,发现案件关键人物陈某华因过度吸食毒品导致器官衰竭,已于2006年死亡。

为此,警方经比对陈某华妻、儿的DNA,认定其与头套、烟头的基因分型符合亲生关系,即物证中的烟头、头套为陈某华所留。

“瘾君子”盯上“有钱人”

据落网的犯罪嫌疑人交代,案发前,曾在梅县松口务工的“春破皮”(在逃)发现张家比较富裕。“松口码头周边唯一一栋且远离其他民居的别墅就是张家,加上张家经营水泥生意,成为当地的有钱人。”办案民警介绍,“春破皮”遂与陈某华商量实施抢劫。

之后,陈某华纠集李某兵、刘某生、“春破皮”,从深圳市赶到梅县松口。案发前一天晚上,嫌疑人躲在张家后面150米远的地方,抽烟并等待时机作案。29日零时左右,“春破皮”趁受害人一家休息时,沿水管爬入张家,打开大门让其他嫌疑人进入。嫌疑人一伙将受害人一家三口捆绑封嘴,抢劫作案后逃至深圳。

据当年侦办该案的民警回忆,当时嫌疑人将张某一家三人分别控制于不同房间,嫌疑人逃离后,受害人张某昌的妻子古某挣脱绳索并解救了其女儿,接着跑出屋外呼救。当人们赶去解救张某昌时,张某昌已经窒息死亡。

至此,这起18年的命案积案终于侦破。

目前,案件的办理和追逃工作仍在进行中,公安机关敦促在逃人员主动投案自首,并且希望知情群众积极提供在逃人员线索。

邓新建 《法制与新闻》记者 邓君

原标题:命案积案多年未告破 警方从7枚烟头找到关键信息

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