The shooting happened around 12:05 p.m. Thursday at the Canal Port Park area in Morris, police said.
Officers found two gunshot victims and a weapon at the scene, near West Illinois Avenue and Fulton Avenue. Chopper 7 was over a large police there.
One man was pronounced dead at the scene and another was taken to a local hospital for treatment.
The Grundy County Coroner's Office later identified the man killed as 47-year-old Terry A. Barnett Jr. of Marion. An autopsy is scheduled for later Friday.
Police believe the shooting stemmed from a domestic issue, and there is no threat to the public.
Authorities did not immediately provide further information.
The video in the player above is from a previous report.