LONDON -- Ozzy Osbourne died of a heart attack and had coronary artery disease in addition to suffering from Parkinson's disease for years, his death certificate said.

The singer had suffered from coronary artery disease as well as Parkinson's, according to the certificate filed at a register office in London and obtained by The New York Times on Tuesday. Osbourne died on July 22 at 76.

An email from The Associated Press requesting confirmation from the registry office in Hillingdon Council in northwest London, which covers the district where the Black Sabbath singer was reportedly officially pronounced dead, was not immediately returned. Osbourne's representatives didn't immediately return the AP's emailed requests for comment.

The document was submitted by Osbourne's daughter Aimée

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