Ozzy Osbourne died at age 76 of a heart attack, according to his death certificate obtained by the New York Times and the U.K. Sun.

Ozzy Osbourne's cause of death has reportedly been determined. The former Black Sabbath frontman and reality TV personality died of "out of hospital cardiac arrest" and "acute myocardial infarction," with coronary artery disease and Parkinson's disease with autonomic dysfunction listed as "joint causes at age 76 on July 22.

Ozzy Osbourne's official cause of death has been revealed as a heart attack, according to his death certificate. Coronary artery disease and Parkinson’s disease were listed as "joint causes.” Osbourne died on July 22 at the age of 76 just weeks after reuniting with his former Black Sabbath bandmates.