“I feel unhappy I am so sad. I lost the best friend I ever had,” wrote Kelly Osbourne alongside a broken heart emoji over a black background.

Kelly Osbourne says she has lost her "best friend" following the death of her father Ozzy Osbourne.

He became known as the Prince of Darkness and, relatedly, the godfather of heavy metal, which emerged as the name for the subgenre that flourished and then fractured in the wake of Black Sabbath’s su...