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Chicago police have charged four people in the fatal shooting of 9-year-old Antonio Smith Junior on Chicago's South Side.

Charged with first-degree murder are the suspected gunman, Derrick Allmon, 19, of the 7400 block of South Shore Drive; Jabari Williams, 22, of the 1900 block of North Sycamore Street in Hanover Park; Paris Denard, 19, of the 7300 block of South Dorchester Avenue; and Michael Baker, 19, of the 8100 block of South Wentworth Avenue.

Smith was shot at least four times in the 1200 block of east 71st St. a few blocks from his home on Aug. 20. His body was found in a backyard.

Police say the men may have targeted him, because they thought he shouted a warning to rival gangbangers.

Smith is the youngest victim of gun violence in Chicago so far this year.

The suspects are all due in bond court on Saturday.

The Chicago Tribune contributed to this report.