Derrick Walker was 33 when he was killed on July 15, 2012, near Seven Mile and Waltham in Detroit. His death was ruled a homicide during a summer that saw a marked increase in violent crime across the city.

Public details about the killing are sparse. The sequence of events, any motive, and whether there were witnesses or persons of interest have not been released, and no arrests have been publicly announced.

If anyone recalls seeing or hearing anything around Seven Mile and Waltham on July 15, 2012, or has information that might help, please share what is known with the Detroit Police Department.