Kirk Alston was 42 when he was found dead in Philadelphia on August 7, 2012, one of many victims during a summer marked by a surge in gun violence.

Authorities never determined a motive, and despite appeals for help, no witnesses came forward with information that led to an arrest. No suspects have been publicly identified and the investigation remains open and unsolved.

If anyone knew Kirk, saw anything in his neighborhood on or around August 7, 2012, or has information that could help investigators, please come forward.