The 15-year-old charged in the case faces first-degree murder and felony attempted robbery with a firearm.
"The south suburban departments and the FBI were of great assistance to the detectives in this cases, working together as a team because the south suburban departments were very familiar with this crew and believe they know some of these offenders," Deenihan said. "Eventually, through evidence and through some technology, the detectives were able to narrow it down to these four individuals."
The teen was arrested by the Great Lakes Regional Task Force Wednesday afternoon in the 400 block of West 16th Street, in Chicago Heights, according to police. A gun was recovered through a search warrant and testing was underway to determine if it was the weapon used in Williams' fatal shooting.