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

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.

Ozzy Osbourne's cause of death has been revealed to be a heart attack, according to his death certificate publicly filed in London on Tuesday. The document further noted that the Black Sabbath frontman and beloved Prince of Darkness also suffered from Parkinson's disease prior to his death at age 76 two weeks ago.

Metallica bassist Robert Trujillo has shared his reflections on iconic Black Sabbath frontman Ozzy Osbourne’s funeral. Last month the musician – whose real name was John Osbourne – died aged 76 following a long period of living with Parkinson’s and other health problems.