Ozzy Osbourne's official cause of death has been revealed two weeks after the rock legend died in Birminghamshire, England on July 22.

Ozzy Osbourne's cause of death has been revealed. The Black Sabbath rocker died at age 76 from a heart attack, according to his death certificate obtained by The New York Times and The Sun.

A death certificate filed at a register office in London revealed that Ozzy Osbourne's cause of death was a heart attack.