Jack Russell, former lead singer of Great White, has announced his retirement from touring due to a recent diagnosis of Lewy body dementia and multiple system atrophy, impacting his ability to perform. Lewy body dementia, the second most common neurodegenerative dementia after Alzheimer's, affects memory, decision-making, and motor functions, often leading to misdiagnosis. Russell, known for hits like 'Once Bitten, Twice Shy,' has released an autobiography titled 'The True Tale of Mista Bone: A Rock + Roll Narrative' with reflections on his career and struggles. The book includes contributions from notable figures like Lita Ford and is available in various formats. Russell's retirement marks the end of a long career that saw him performing with Great White and later as Jack Russell's Great White.