Bolingbrook police responded just before 11:45 p.m. to the 500-block of Rebecca Lane for a report of a man who had been shot.
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When officers arrived, they found Sian Carter, 20, of Bolingbrook unresponsive in the backyard of a home, police said.
Police officers began lifesaving measures, and paramedics took Carter to a local hospital, where he later died.
Several shell casings were found at the scene, according to police.
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It was not immediately clear what led up to the incident.
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Anyone with information on the incident is asked to call Bolingbrook police at 630-226-8620. To remain anonymous, call Crime Stoppers at 630-378-4772.
Tips can also be submitted at bolingbrookcrimestoppers.org or by using the mobile P3 Tips app.
All contact with Crime Stoppers is anonymous, and, if the information leads to an arrest, a cash reward may be issued, police said.