Kelly Osbourne is mourning the loss of her father Ozzy following his death on Tuesday. Osbourne posted a brief message to her Instagram stories on Thursday afternoon. “I feel unhappy I am so sad,” she wrote. “I lost the best friend I ever had.”

Ozzy Osbourne, the world-renowned heavy music and cultural icon who died Tuesday a few weeks following his final live performance, led myriad lives: The lovable if bumbling patriarch of hit reality show The Osbournes; metal progenitor as Black Sabbath’s ...