The heavy metal rockstar died on July 22, weeks after he reunited with his Black Sabbath bandmates for the band's final performance.

Ozzy Osbourne’s official cause of death has been revealed after his July 22 death at the age of 76. According to a death certificate obtained by The New York Times and The Sun, the former Black Sabbath frontman died of “out of hospital cardiac arrest” and “acute myocardial infarction,

Osbourne’s death certificate reveals the Black Sabbath frontman died from a heart attack. Coronary artery disease and Parkinson’s disease were listed as contributing factors.