Chicago, Illinois — Prosecutors say a deadly early-morning stabbing aboard a Chicago train was not only unprovoked, but deliberately recorded by the suspect as it unfolded. Authorities allege the accused killer filmed the attack on his cellphone, then turned the camera on himself afterward while making incriminating statements.
The suspect, Demetrius Thurman, 40, is charged with first-degree murder in the death of Dominique Pollion, 37, who was stabbed while sleeping on a Chicago Transit Authority Blue Line train early Saturday morning.
Victim Was Asleep When Attack Occurred
According to court records cited by prosecutors, Pollion had been asleep in the train car for nearly an hour before the stabbing and had no interaction with Thurman prior to the attack. Investigators say the two men did not know each other.
At approximately 2:17 a.m., prosecutors allege Thurman approached Pollion from behind and began recording on his phone before launching the attack.
Authorities say the stabbing was sudden and unprovoked, catching the victim completely off guard.
Prosecutors Detail Recorded Attack
Court documents allege Thurman stabbed Pollion once in the chest near the heart and once in the abdomen using a knife with a bright-orange handle.
Pollion reportedly woke up screaming and attempted to move away down the aisle of the train before collapsing from his injuries. Prosecutors say Thurman then exited the train car and switched trains.
Pollion was transported to a nearby hospital, where he later died from his injuries.
Surveillance and Cellphone Video Capture Evidence
Prosecutors say the entire incident was captured on multiple forms of video.
CTA surveillance footage allegedly shows the stabbing and the moments afterward. In addition, investigators say Thurman’s own cellphone contained video recordings of the attack, including footage taken immediately afterward.
Court documents state that after the stabbing, Thurman pointed the phone toward himself, recording his face.
When the train arrived at the Clark/Lake station, another passenger alerted security officers on the platform. While outside the train car, prosecutors allege Thurman again turned the camera on himself and said:
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“Somebody got his ass.”
He then left the station, according to court records.
Facial Recognition and Prior Police Encounter Lead to Arrest
Investigators gathered images from CTA surveillance footage and submitted them to Illinois’ facial recognition system, which prosecutors say helped identify Thurman.
Police later issued a bulletin, and a Chicago police officer recognized Thurman after realizing he had encountered him just days earlier. During that prior interaction, Thurman had reportedly been sleeping on a Blue Line train and provided his driver’s license to the officer.
Thurman was arrested on Sunday.
Evidence Found at Time of Arrest
According to prosecutors, Thurman was wearing the same clothing seen in surveillance video when he was taken into custody. Police also recovered a cellphone that allegedly contained:
- Videos of the stabbing
- Recordings of Thurman after the attack
- Photos of other passengers sleeping on the train
Prosecutors also stated that Thurman’s cousin identified him as the individual seen in surveillance footage and that Thurman admitted to stabbing Pollion.
Charges Filed as Case Moves Forward
Thurman has been formally charged with first-degree murder. He remains in custody as the case proceeds through the court system. Prosecutors have not yet detailed whether they will seek additional charges or enhanced penalties.
The killing has renewed concerns about safety on public transportation, particularly during overnight hours when fewer passengers and staff are present.
Community Reaction and Transit Safety Concerns
The case has sparked alarm among Chicago riders, with many questioning how a sleeping passenger could be attacked without warning and how long it took for help to arrive.
Transit officials have not yet commented publicly on whether additional safety measures or patrols will be considered in response to the incident.
As the legal process unfolds, investigators say video evidence will play a central role in the prosecution.
Do you think public transit systems are doing enough to protect passengers during overnight hours, or should more safety measures be in place? Share your thoughts in the comments below.
