Jack Osbourne posted a tribute to his late father, Ozzy Osbourne, on Instagram Wednesday. The former Black Sabbath member died July 22 at 76 years of age.

Jack Osbourne has broken his silence two weeks after the death of his father, rock legend Ozzy Osbourne. Jack, 39, shared an emotional tribute to his dad on Instagram late Tuesday night, along with a video montage of moments with Ozzy throughout his entire life.

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,

Ozzy Osbourne — the heavy metal rockstar turned reality television pioneer — died of a heart attack, his death certificate revealed, according to multiple reports