Jack Osbourne has paid a heartbreaking tribute to his father Ozzy, just days after he was laid to rest. The Black Sabbath frontman, who was diagnosed with Parkinson's disease in 2019, passed away at the age of 76 on July 22 surrounded by his family.

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. The death certificate reportedly listed Osbourne's cause of death as "out of hospital cardiac arrest,