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.

Osbourne, the legendary frontman of Black Sabbath and a pioneer of heavy metal, died July 22 at his home in Buckinghamshire, England.

The cause was disclosed on a death certificate that the late Black Sabbath singer’s eldest daughter submitted in London