In the late hours of a Thursday night in Michigan City, Indiana, a distressing 911 call shattered the calm, setting in motion a tragic sequence of events that would claim the life of 25-year-old Treven Armstrong. The call, received by the LaPorte County Regional Dispatch Center at approximately 10:58 p.m. on May 29, 2025, came from a man asserting that someone was attempting to kill him in the vicinity of Dewey Street and Michigan Boulevard.
Responding officers located a man near the
area, and as they were speaking with him, another individual emerged from a residence at 1824 E. Michigan Boulevard with the alarming news that someone inside had been shot. The situation quickly escalated, prompting a response from multiple law enforcement agencies, including officers from Michigan City, Long Beach, Trail Creek, and the LaPorte County Sheriff's Department. Inside the home, they discovered two brothers suffering from gunshot wounds: Treven Armstrong of Gary, Indiana, and his 24-year-old brother, Christopher Armstrong, of Indianapolis.
Both brothers were in critical need of medical attention. Treven Armstrong tragically succumbed to his injuries and was pronounced dead. Christopher Armstrong, with life-threatening wounds, was initially transported to Franciscan Hospital before being transferred to South Bend Memorial Hospital for more advanced care.
The Michigan City Police Investigative Division promptly took over the case. With assistance from the LaPorte County Prosecutor's Office, investigators secured a search warrant for the residence, where they collected evidence and interviewed witnesses. Their investigation swiftly pointed to 23-year-old D'Marcus Thompson of Gary as the suspect responsible for the shooting. Thompson was located and arrested by an officer in the 300 block of South Woodland Avenue. At the time of his arrest, he was found to be in possession of a 9mm handgun. Following a review of the investigation's findings, formal charges were filed against Thompson, including murder, attempted murder, aggravated battery, and criminal recklessness. A judge set his bond at $1 million in cash.
