The shooting happened around 3:20 p.m. in the 2100 block of South 59th Avenue in Cicero.
Police officers found a 17-year-old who had been shot, officials said. He was taken to a hospital, where he later died.
The victim's identity has not been released.
Officials confirmed the victim was a student at Morton East High School, and the shooting happened nearby shortly after dismissal.
No arrests have been made.
Cicero police continue to investigate.