Zacari Johnson, a 20-year-old African American man from Chicago Heights, was killed on September 9, 2018 in Sauk Village. Officers responded to reports of shots fired around 1:30 p.m. and found Johnson with a gunshot wound to the head inside a vehicle in the 21000 block of Carol Avenue. He was taken to Christ Medical Center in Oak Lawn and died hours later; the Cook County medical examiner ruled the death a homicide.

Two other people were in the vehicle when the shooting occurred. Investigators say shots were fired both from and at the vehicle in an exchange of gunfire. The two occupants fled the scene but were later taken into custody, and charges were pending against them in connection with the shooting.

What information about the events leading up to the exchange of gunfire or possible additional suspects might help explain why this happened?