Tony Iommi, Black Sabbath guitarist and co-founder, told UK broadcaster ITV that Osbourne was “frustrated” during the band’s farewell concert on July 5. The heavy metal icon died less than three weeks later, on July 22, at age 76.

Osbourne’s solo career has always been managed by Sharon. While recording his second solo album, Diary of a Madman, guitarist Rhodes died in a tragic light plane crash. Osbourne was close to Rhodes and fell into a deep depression, after never having lost someone so close.