The man was discovered at approximately 12 a.m. on the first floor of a three-story building where he lived in the 1000-block of West 59th Street in Chicago's Englewood neighborhood. Police say they found his decomposed body during a well-being check.
The man is identified as John Rich Sr., 66.
Authorities said Tuesday that Rich's death not a criminal investigation. Some published reports suggested he had been shot, but the medical examiner would only say Tuesday that a bullet was found near his body.
Police say they are treating the case as a death investigation.
Off camera, members of Rich's family said his wallet was missing, two cars were missing from the home, and they said there were signs of forced entry at the back door.
For relatives, questions remain about how Rich died and whether he might have been robbed first, then died, or possibly vice versa.
Police say they are looking into the family's claims.
The results of Tuesday's autopsy could shed some light on the mysterious death. A spokesperson for the medical examiner's office said the autopsy was set to be completed by 1 p.m.