"I didn’t realize then that I would never see Ozzy again after that night," Butler writes of the July 5 "Back to the Beginning" show in England.

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.

In the wake of making the troublesome latter album, Osbourne bolted the group in 1977 and embarked on a solo project, Blizzard of Ozz, and was replaced by singer Dave Walker of Savoy Brown. However, he swiftly changed his mind and returned to the Sabbath fold for a dismal collection ironically titled “Never Say Die!”