Devon Theisen, 21, was shot to death on the front porch of a Park Avenue residence in Council Bluffs, Iowa, on Sunday, October 7, 2018. Responders arrived shortly before 3 p.m. after reports of a shooting and found Theisen with a gunshot wound to the head; he was taken to a hospital and later pronounced dead.

Witnesses at the scene described a disturbance between Theisen and 69-year-old Kenneth Still that escalated when Still retrieved a shotgun from inside the home and fired a single shot that struck Theisen. Still left the area in a green SUV but surrendered to authorities the next morning, October 8, and was charged with first-degree murder.

Details about motive and the events leading up to the confrontation remain unclear. Does anyone have information about what happened on Park Avenue that afternoon or knew either man?