Eric Billups, 16, was on his way home April, but instead was shot multiple times at a bus stop and later died at the hospital.
The shooting happened at a bus stop in the 6300-block of South Stony Island Avenue near the local YMCA.
A 16-year-old girl was also shot in the left leg; she was taken to UChicago in fair condition, CPD said.
Nearly four months after the killing of Billups, police arrested a 15-year-old. Chicago police did not name the suspect because he is a minor.
The teen suspect was charged with first-degree murder, attempted murder, aggravated battery and intimidation. All are felony charges.
READ MORE | Two 16-year-old students shot, 1 fatally, at South Side bus stop near YMCA, Chicago police say