David Buckner, 47, was killed on August 7, 2010, in Ada Park on Chicago’s Far South Side after two rival gangs began exchanging gunfire around 7:30 p.m. Buckner was not involved in the confrontation; he was struck in the back and died at the scene while his family outing in the park turned deadly.

Reports say authorities had been warned about the potential for violence roughly 12 hours earlier, with 911 calls placed that day. Police were reportedly present in the area before the shooting, but the presence did not prevent the attack. Buckner’s death became part of criticism aimed at local officials and community leaders about handling of gang violence in Chicago in 2010.

If anyone was at Ada Park that evening or has information about the shooting, please share what is known.