Shortly after midnight on April 20, 2013, 34-year-old Lucas A. Zimmerman was found unresponsive in the parking lot of a convenience store on the 3900 block of North Kimball Avenue in Chicago’s Irving Park neighborhood. He had multiple gunshot wounds and was pronounced dead at 12:25 a.m. Witnesses told police Zimmerman had been shot moments earlier in a nearby alley off the 3300 block of West Irving Park Road and staggered toward the lot before collapsing. Reports describe wounds to the arm and face, consistent with a close-range attack.

Zimmerman was listed as living on the 4800 block of North Damen Avenue. Police opened a homicide investigation and canvassed the area the same night, but no one was in custody by morning. Subsequent listings of weekend shootings have repeated the circumstances without naming a suspect or announcing charges. Did anyone in Irving Park at the time see or hear anything that could help clear up what happened that night?