Police say they found the 26-year-old victim dead in the living room of his family's home.
Police are questioning the man's father about the shooting, but no charges have been filed.
Timothy Lithtow, 26, of the 3700-block of W. 216th St. in Matteson, died of multiple gunshots at that address and was pronounced dead at the scene at 11:16 p.m. by the Cook County medical examiner.