Osbourne’s death certificate reveals the Black Sabbath frontman died from a heart attack. Coronary artery disease and Parkinson’s disease were listed as contributing factors.

Ozzy Osbourne, the heavy metal and reality television star, died of a heart attack and had suffered from coronary artery disease and Parkinson’s, according to a death certificate filed at a registry in London.

Additional details about heavy metal icon Ozzy Osbourne's death last month have surfaced, including his cause of death and additional factors.