Osbourne has tragically passed away at the age of 76—just weeks after it was revealed that he was set to quit his residence in the U.S.

In her first comments since his death, Kelly Osbourne posted the opening lyrics from the song on Instagram with a broken heart emoji: "I feel unhappy I am so sad. I lost the best friend I ever had." The father-daughter duo were known for having a close relationship.

Kelly Osbourne made her first public comments on Thursday, two days after the death of her father, rock legend Ozzy Osbourne. "I feel unhappy I am so sad," Kelly Osbourne wrote in an Instagram story.

Black Sabbath singer Ozzy Osbourne's sisters recall their final interactions before his death at 76, noting he was frail but still joking before a farewell performance in England.

Ozzy Osbourne was at home amid the things he loves most in the days leading up to his death, a source tells PEOPLE. Osbourne, 76, died on Tuesday, July 22, with his family, including wife Sharon, by his side.