Jack Osbourne is opening up about the moment he discovered his father, Ozzy Osbourne, had died. Jack, 39, said he was at home in Los Angeles when he got the tragic news on July 22, having just spent a week with his father and the rest of his family in the U.K. earlier in July. "I woke up in Los Angeles to a knock at my house door, at around 3:45 in the morning. Someone who's worked for my family for probably 30 years now was knocking on my door.