The Sun | Pop heartthrob David Cassidy reveals he is battling dementia and plans to stop touring to concentrate on his health The Sun David Cassidy feared he would end up with dementia after losing his mum. The Seventies teen idol, who first gained fame with his role as Keith in TV sitcom The Partridge Family, revealed all to People magazine in the US. He said: “I was in denial, but ... David Cassidy Has Dementia: Here's What That Means David Cassidy, dementia and his tragic family history Actor David Cassidy Reveals He Has Dementia: Complete List Of Symptoms Of Alzheimer's, Most Common Form Of ... |