Ozzy Osbourne's cause of death revealed After he passed away aged 76 on 22 July, Ozzy Osbournes cause of death has been revealed. 5 August 2025 Ozzy Osbourne's cause of death has been revealed. Ozzy Osbourne's cause of death has been revealed The 76-year-old Black Sabbath frontman died on 22 July following years of health challenges, including a public Parkinson's disease diagnosis in 2019, and documents now show he passed away from an "acute myocardial infarction" and "out of hospital cardiac arrest".