An official cause of death has been confirmed for Ozzy Osbourne. The legendary Black Sabbath frontman died of a heart attack and also suffered from coronary artery disease and Parkinson’s disease, according to a death certificate filed at a registry in London and obtained by The New York Times.

Ozzy Osbourne's cause of death has been revealed. The Black Sabbath rocker died at age 76 from a heart attack, according to his death certificate obtained by The New York Times and The Sun.