Black Sabbath frontman Ozzy Osbourne died following his battle with a genetic form of Parkinson's disease, while a brain expert says the singer's lifestyle could have contributed.

British heavy metal legend Ozzy Osbourne died earlier this week at 76 years old, more than 20 years since the “Prince of Darkness” was first diagnosed with a rare form of genetic Parkinson’s disease. The cause of the Black Sabbath frontman’s recent death has not been made explicit.

Ozzy Osbourne lived with Parkinson's disease for years before his death. Here's what you need to know about the neurodegenerative disease.