Tyler Griffin, 32, was shot and killed in Birmingham, Alabama on Mother’s Day, May 14, 2017. He was at a party on Boise Avenue when someone fired two shots into his back while he was walking away from an argument. The shooting was the city’s 40th homicide of that year.

Griffin’s mother says the dispute involved a man who was upset about car repair work Griffin had done. Nearly 50 people were at the party, but according to authorities no witnesses have come forward to identify a shooter. The Birmingham Police Department lists the homicide as an open investigation; no suspects have been publicly identified and no arrests have been made.

Anyone who was at the Boise Avenue party or who has information about the argument or the person upset over the car repairs is asked to come forward.