Robert Reiling, 60, of Niles, Illinois, died after being shot inside a home on the 8400 block of North Greenwood Avenue on Thursday, October 16, 2025. Police were called about 5:40 p.m. for reports of a man with a gun and shots fired; officers found Reiling mortally wounded. The Cook County Medical Examiner determined the cause of death was a shotgun wound to the head.

Detectives took a suspect into custody quickly. Markus G. Horenberger, 52, of Glenview, was charged with felony involuntary manslaughter. The Niles Police Department’s Investigations Division, with help from the North Regional Major Crimes Task Force, continued to work the case.

If anyone knew Robert Reiling or was in the area that evening, did you see anything that could help investigators?