Black Sabbath's Ozzy Osbourne performed despite being frail in his final public appearance weeks before his death at 76, according to Rage Against the Machine guitarist Tom Morello.

Rocker Tom Morello is shedding light on Ozzy Osbourne’s final Black Sabbath show. The late metal god’s friend, 61, shared that Osbourne knew Black Sabbath’s Back to the Beginning concert July 5 would be his last performance. The Prince of Darkness died July 22 at 76.