The Black Sabbath rocker, who was dubbed the Prince of Darkness, died surrounded by his loved ones on July 22 at age 76.

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.

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