Billy Mays died from heart disease, but final autopsy reports cite cocaine was a contributing factor in the TV ad-man's death, AP reports.

A preliminary examination of the Oxi-Clean pitchman's body had turned up no sign of drug abuse, just the prescription painkillers he was known to be taking for hip surgery. But it turns out he had used coke several days before his death.

Mays, known for his loud, energetic infomercials thrived on his manic energy, as seen in the Tonight Show clip we attached to his obituary. Pair this high-octane working style with his weight and middle age (he died at 50), and it's baffling that he would add cocaine to the mix.