Someone opened fire about 2:50 a.m. in the fourth-floor hallway of the building in the 6400 block of South King Drive, Chicago police said.
A 24-year-old was shot in the back and left side of his torso, while a 42-year-old was shot in the elbow and arm, police said. The third man, 20, was struck in the armpit and leg.
They were taken to the University of Chicago Medical Center, where the 42-year-old was pronounced dead, police said. The two other men were listed in critical condition.
The man who died was identified as Mark Chalmers, the Cook County medical examiner’s office said. An autopsy ruled his death a homicide.
No one is in custody as Area One detectives investigate.