Legendary Black Sabbath frontman Ozzy Osbourne 's cause of death was a heart attack, his death certificate shows. The heavy metal icon died on July 22 at age 76, at Harefield Hospital in the United Kingdom.

A death certificate filed at a register office in London revealed that Ozzy Osbourne's cause of death was a heart attack. The New York Times obtained the document on Tuesday. The lead singer of

Additional details about heavy metal icon Ozzy Osbourne's death last month have surfaced, including his cause of death and additional factors.