"People always thought Ozzy was a feral wild man, but he had a heart of pure gold," he wrote of Osbourne, who died last week at age 76

In an emotional essay, Black Sabbath bassist Geezer Butler reflected on playing with Ozzy Osbourne for the final time.

Geezer Butler of Black Sabbath didn't just lose a bandmate with the death of Ozzy Osbourne - he also lost a friend.