The man, identified to the Cook County Medical Examiner's Office as Patrick Dooley, was found dead in his apartment where he lived alone in the 100-block of North Austin Boulevard after a well-being check at about 7:40 p.m. Saturday, police said.
Dooley's death was ruled a homicide. An autopsy said he died from multiple injuries from an assault.
Police said that there were no signs of forced entry into the apartment and the public was never at risk.