Legendary rock star Ozzy Osbourne's cause of death was revealed on Tuesday, with documents showing he had a heart attack.

Osbourne died from cardiac arrest and acute myocardial infarction with Parkinson's disease and autonomic dysfunction as joint causes, according to The New York Times and The Sun .

The New York Times also reported that Osbourne's daughter, Aimee Osbourne, submitted his death certificate at a London registry.

Osbourne died on July 22 at the age of 76.

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