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.

Ozzy Osbourne, lead singer of Black Sabbath, has died at age 76. He said he had been previously diagnosed with a form of Parkinson’s disease linked to the gene PRKN