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.

Ozzy Osbourne’s cause of death has been revealed. The Black Sabbath frontman officially died at age 76 from cardiac arrest, acute myocardial infarction, coronary artery disease and Parkinson’s disease on July 22, according to a death certificate obtained by The Sun on Tuesday.