Christopher Sims was 21 when he was shot dead in Detroit on August 27, 2015. He and his friend, 23-year-old Michael Stewart, were sitting in an orange 2014 Lincoln MKZ on Coyle Street when an unknown assailant walked up and opened fire, killing both young men.

Witness descriptions say the gunman was a Black male about 22 to 24 years old, medium complexion, with four braids, wearing all black. After the shooting he fled in a purple Chevrolet minivan with tinted windows and a for sale sign in the rear window. Sims had left his mother’s home that evening to get the oil changed in his father’s car, then picked up Stewart and went to a friend’s house; he spoke with his mother by phone around 12:30 a.m. shortly before the shooting.

If anyone knew Christopher or Michael, or saw activity on Coyle Street that night, please share what you know with investigators.