Legendary Black Sabbath frontman Ozzy Osbourne 's cause of death was a heart attack, his death certificate shows. The heavy metal icon died on July 22 at age 76, at Harefield Hospital in the United Kingdom.

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

Ozzy Osbourne died of a heart attack, the New York Times reports. The cause of death was revealed by a death certificate filed by Osbourne’s eldest daughter at a registry in London. The certificate also lists coronary artery disease and Parkinson’s disease as contributing factors.