Ozzy Osbourne‘s family is mourning the late rock legend following his death at age 76 on Tuesday. On Thursday, the Black Sabbath frontman’s daughter Kelly Osbourne expressed her grief with a reference to the British heavy metal band’s 1972 ballad ‘Changes’ on her Instagram Story.

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.

On July 22, Kelly Osbourne, along with mom Sharon Osbourne, siblings Jack Osbourne and Aimee Osbourne, as well as half-sibling Louis Osbourne, from the singer's previous marriage to Thelma Riley, released a statement confirming the Black Sabbath lead singer's death.