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. The death certificate reportedly listed Osbourne's cause of death as "out of hospital cardiac arrest,

Ozzy Osbourne's official cause of death has reportedly been revealed two weeks after the rock legend died in Birminghamshire, England on July 22.

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.