Investigators say a fire hidden in a basement room and a collapse above it turned a residential response into a fatal line-of-duty case.
CHICAGO, Ill. — The allegations in the death of Chicago firefighter Michael Altman focus on a specific sequence inside a Rogers Park apartment building, where prosecutors say a concealed basement fire and a sudden structural collapse turned a late-morning response into a fatal emergency.
Rather than resting mainly on grief or courtroom theater, the case turns on physical steps investigators say can be traced through witness accounts, surveillance footage and the layout of the building at 1757 W. North Shore Ave. Authorities say a former resident entered the property repeatedly, started a fire in the basement boiler room and left conditions that firefighters encountered minutes before the first floor failed.
Court records describe the building as one where the defendant, Sheaves Slate, had a long and uneasy presence even after moving out about nine months earlier. On March 2, a basement tenant complained he was inside maintenance and boiler-room space, and a property manager told him to leave after finding him in the laundry room, prosecutors said. On March 15, tenants reported seeing him again in the basement laundry area. Nearby surveillance video also captured him there late that morning, according to prosecutors. That evening he returned to the third floor carrying bags and knocked on the door of his former apartment, where a confrontation followed and, according to a witness, ended with a threat directed at residents.
The prosecution’s reconstruction narrows further after 11 p.m. on March 15. Video, they say, showed Slate back inside the building and staying there into the early morning. Tenants reported seeing him asleep in the hallway outside the former apartment. Around 4 a.m., someone told him to leave, and footage showed him exit. Prosecutors say he then reentered through a broken basement window and went into the maintenance and boiler room, where he remained for several hours. Their claim is that he used a lighter to ignite a mattress in that room. When he could not control the flames, prosecutors said, he positioned a door in front of the room. Investigators believe that move concealed smoke and slowed detection by people upstairs.
By roughly 11:20 a.m. March 16, prosecutors say, video captured him leaving through an alley and heading toward a bus stop. Minutes later smoke began spreading through the building. Residents noticed it shortly before 11:30 a.m. and called 911. Fire crews responded around the same time to the three-story residential structure. Altman, a firefighter assigned to Truck 47, was operating on the first floor while others worked below. Prosecutors say firefighters in the basement moved the door set in front of the room where the mattress had been burning. That action exposed conditions that led the ceiling above to fail. Because the ceiling of the basement also formed the first-floor structure, the collapse opened the floor beneath Altman.
He fell into the basement, into a fire officials say quickly engulfed him. Altman was pulled out within about a minute, according to early reporting, but the injuries were devastating. Officials said he suffered burns over 90% of his body and was taken to Stroger Hospital, where he died March 17. In this telling, the central fact is not only that a fire was intentionally set, but that the way it burned inside a hidden basement space created a trap for firefighters operating one level above. That detail is what connects the alleged arson to the line-of-duty death charge now at the center of the prosecution.
The account continues after the collapse. Prosecutors say Slate boarded a bus, then took the Red Line to the Harold Washington Library, where he changed clothes and dyed his hair. The following day, they say, he checked himself into a hospital with suicidal thoughts and was arrested there. He has been charged with murder, aggravated arson and residential arson, and a judge later ordered him held pending trial. Prosecutors also said he told investigators he was depressed, suicidal and upset by poor relationships with friends in the building. Those statements may become important later as the case moves toward motions and trial.
For now, the building itself remains the silent witness in the case: a former apartment home, a basement room, a broken window, a mattress, a door and a collapse timed within minutes of firefighter entry. The next public test of the prosecution’s reconstruction will come in court as defense lawyers challenge what can be proved about movement, intent and the exact mechanics of the fatal fire.
Author note: Last updated April 15, 2026.