David Cassidy became a teen heartthrob at 19 and by 21, he was the highest paid solo performer in the world. The singer, songwriter and actor, who also admits that he’s an alcoholic, recently revealed that he is suffering from dementia and is stepping out of the spotlight. The announcement comes following a recent performance where he fell down on stage and appeared to forget lyrics to songs he’s been singing for decades.

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In the video above, from Wednesday’s exclusive interview with Dr. Phil, watch part of the 66-year-old’s recent California performance that had fans questioning his sobriety.

WATCH: David Cassidy Opens Up About His Dementia Diagnosis

On Wednesday’s episode, hear more from Cassidy about his diagnosis and how he explains his behavior at the concert. Check here to see where you can watch.

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David Cassidy Opens Up About His Past Binges With Alcohol