WILL COUNTY - A 15-year-old boy has been charged with murder in connection with the fatal shooting of a 13-year-old boy earlier this week in Chicago's southwest suburbs.

What we know:

Joliet police arrested the 15-year-old and charged him with three counts of first-degree murder and one count of aggravated unlawful possession of a weapon.

The charges stem from a deadly shooting that happened Monday in a rear alley in the 300 block of Desplaines Street. Officers found the 13-year-old victim with gunshot wounds around 4:42 p.m. The boy was dead at the scene.

Detectives say the suspect and victim knew each other and had an ongoing personal dispute. Investigators believe the 15-year-old shot the younger teen twice during a confrontation.

According to police, the suspect was taken into c

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