Kelly Osbourne is mourning the death of her dad and rock legend Ozzy. On Thursday, the musician and daughter of the Black Sabbath frontman returned to social media for the first time, using the opening line to “Changes.” “I feel unhappy,” she wrote. “I am so sad. I lost the best friend I ever had.”

Osbourne died this past Tuesday, at the age of seventy-six; his family didn’t announce a cause, but he had previously disclosed that he had Parkinson’s disease. By the time of his death, Osbourne had been doubly transformed by Iommi’s good idea about “evil.