CHICAGO – An autopsy on the exhumed body of a Chicago lottery winner poisoned with cyanide yielded no significant new clues about his death, the Cook County medical examiner said Friday.

No remaining cyanide was found in samples of Urooj Khan's body tissue, likely because cyanide breaks down over time, and there was nothing notable from tests on his stomach contents, Stephen Cina told reporters.

Cina did say Khan's coronary arteries had significant blockage, which could have increased the effectiveness of the cyanide. But he said there was nothing to make him think a heart attack killed Khan, saying, "I don't see how I can ignore lethal cyanide level in the blood."