CHICAGO (CBS) — A 73-year-old man was found dead with a gunshot wound to the head in the 1400 block of West Sheridan.

Chicago police said during a preliminary investigation, it looked like the man may have been shot during a robbery.

The man’s body was discovered shortly after 10:00 a.m. Sunday. He was walking two dogs when he was shot by a suspect wearing a mask.

Area North detectives are investigating. So far, no one is in custody.