Ozzy Osbourne's heart monitored '15 times a day' before his death Ozzy Osbourne was closely monitored by doctors in the weeks before his death to make sure he was fit enough to perform at the final Black Sabbath gig. 23 July 2025 Ozzy Osbourne had his heart monitored "15 times a day" in the weeks before his death. Ozzy Osbourne was closely monitored by doctors The rocker died on Tuesday (22.07.