2015年5月25日，甘肃临夏烟花店老板怡某红失踪，6月26日警方在距还车点约30米处发现其尸体，鉴定为机械性窒息死亡1。被告人马某林因拒不认罪，一审法院2018年4月认为指控其抢劫、故意杀人罪"事实不清、证据不足"，仅按盗窃罪判处有期徒刑十年1。二审法院甘肃省高级人民法院维持原判，适用了"疑罪从无"原则1。此案就此陷入十年悬案。
2022年最高检发现此案后，通过深度电子数据分析实现了案情突破1。侦查人员调取了190多次通话记录、手机基站轨迹数据、银行监控等证据，证实尾号3287手机由马某林使用、专门用于联络怡某红1。兰州市检察院的鉴定结果显示，两部手机信号自案发当晚22时许起在临夏市进入并轨状态，同步向和政县方向移动，轨迹途经马某林家中和埋尸现场，停留时间分别约1小时和3小时1。此外，尾号3287手机信号在埋尸点附近逗留约16分钟，被推定为马某林的埋尸踩点1。通过手机轨迹分析，侦查机关还排除了另一嫌疑人王龙的作案可能，其信号轨迹鉴定显示其在案发时间段出现在别的县、市1。
基于电子数据的有力支撑，最高检于2023年12月向最高法提出抗诉1。2024年8月再审开庭，兰州市检察院司法鉴定人员出庭作证1。12月，甘肃省高级法院改判马某林犯抢劫罪并致人死亡，判处死缓并限制减刑1。改判的时间点令人瞩目——马某林原判刑满释放日期为2024年12月21日，改判发生于12月，距其原定刑满仅剩8天1。
A ten-year-old homicide case in Linxia, Gansu Province has reached a turning point through digital forensic evidence. Ma Moujlin, originally convicted only of theft and scheduled for release in December 2024, was retried and convicted of robbery resulting in death, receiving a suspended death sentence with restrictions on sentence reduction.1
The case began on May 25, 2015, when Yi Moujhong, owner of a fireworks shop, went missing in Linxia. On June 26, police discovered her body approximately 30 meters from a car return point; autopsy findings indicated mechanical asphyxiation as the cause of death.1 Initially, prosecutors charged Ma Moujlin with robbery and intentional homicide, but the primary trial court in April 2018 determined the evidence insufficient and facts unclear regarding these charges. The court convicted Ma only of theft, sentencing him to ten years imprisonment.1 The Gansu Provincial High People's Court upheld this verdict, applying the principle of "when in doubt, acquit."1
The case's reversal came after the Supreme People's Procuratorate identified critical electronic evidence in 2022. Investigators examined over 190 call records, mobile phone base station trajectory data, and bank surveillance footage.1 Analysis confirmed that a phone ending in 3287 belonged to Ma Moujlin and was used specifically to contact the victim.1 Signal data from Lanzhou Municipal Procuratorate showed that two phones entered a synchronized state beginning around 10 p.m. on the night of the incident, moving together toward Hezheng County with trajectories passing through Ma's residence and the burial site, with the phones remaining at each location for approximately one hour and three hours respectively.1 The phone ending in 3287 lingered approximately 16 minutes near the burial location, suggesting Ma's involvement in site preparation.1 Additionally, forensic analysis excluded another suspect, Wang Long, whose phone signal placed him in a different county or city at the time of the crime.1 Based on this evidence, the Supreme People's Procuratorate filed a protest in December 2023, leading to a retrial in August 2024, where forensic experts testified for the prosecution.1 The Gansu Provincial High Court's December 2024 decision to convict Ma of robbery resulting in death came merely eight days before his original sentence would have expired on December 21, 2024.1
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