The boy was inside a home in the 3100-block of West Flournoy Street in the city's Lawndale neighborhood about 4:25 a.m. with another boy when they found a gun, police said.
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The gun went off once, shooting the boy in the chest, CPD said.
Police took the boy to Mt. Sinai Hospital, where died just after 5:30 a.m.
SEE ALSO: 14-year-old boy seriously injured in West Englewood shooting: Chicago police
The Cook County Medical Examiner's Office identified him as Jacari A. Brown.
He lived on the same block, where the shooting occurred, the medical examiner said.
No other injuries were reported.
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The weapon was recovered on the scene.
Area Four detectives are investigating.
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