Authorities say a bullet wound an 87-year-old Chicago man suffered seven decades ago contributed to his death last weekend.

Cook County Medical Examiner's Office spokesman Frank Shuftan says an autopsy on Wednesday determined that a gunshot injury caused complications to Tom Buchanan's abdomen that "ultimately killed him."

Shufton says the death has been ruled a homicide, but that his office has no details about the shooting.

Buchanan's 82-year-old cousin Mattie Matthews says the shooting happened in the 1940s. She says she remembers her mother and her aunt talking about it but she was never told any details and Buchanan never said much about it.

Matthews says she took Buchanan to the hospital on Saturday because he was suffering abdominal pain and that he died the next day.