Yes, Black Sabbath ( Tony Iommi, Geezer Butler and Bill Ward) fired Osbourne in 1979 over his substance abuse and an overall disinterest in doing anything with the band. They replace Ozzy with Ronnie James Dio, ushering in the "Heaven and Hell" era—and the longstanding rumor that Ozzy held a grudge against Dio. But is that true?

Osbourne’s death comes less than three weeks after his final performance with heavy metal group Black Sabbath. The “Back to the Beginning” concert featured an all-star lineup and raised a record $190 million for charity.