Salvador Diaz was shot dead outside of a vehicle early Thursday in the Gage Park neighborhood.
Diaz, 27, had just exited the vehicle in the 5300 block of South Talman Avenue when a gunman walked up and opened fire about 2:50 a.m., authorities said.
After being shot, Diaz tried to run away and eventually collapsed in a nearby alley, authorities said.
Emergency crews found Diaz of the 500 block of South Spaulding Avenue, in an alley and took him to John H. Stroger Jr. Hospital of Cook County, where he died at 3:56 a.m., authorities said.
A 37-year-old suspect was taken into custody about 4 a.m. and charges are pending, police said. The shooting may have been gang-related, police said.
Area Central detectives are investigating.