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.

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.

Jack Osbourne breaks his silence on his dad, Ozzy Osbourne's, death, one week after the rocker was laid to rest. The 39-year-old admits his heart is still 'full of so much sadness and sorrow' since his dad died suddenly of a heart attack in July.