Police found Nathaniel T. Jackson, 49, shot in the head on a sidewalk in front of a convenience store Thursday. He was taken to Stroger Hospital and pronounced dead, the Chicago Sun-Times reported Friday.
The city last recorded 500 homicides in 2008, when 512 people were killed.
Homicides were up 17 percent and shootings up 11 percent over last year as of Thursday, police statistics indicate.
Unseasonable warmth early in the year contributed to the spike in homicides, which in the first three months of 2012 ran about 60 percent of the 2011 rate, the Chicago Tribune said.