The fans of former “Partridge Family” star David Cassidy were left startled and concerned after a performance on Saturday night in Agoura, California. During his performance, the singer slurred his words, forget the words to his own music, hit is face with the microphone, and fell backwards off the stage.

The botched performance startled his fans

Fans of David Cassidy who saw his performance on Saturday grew concerned about the singer’s health and wellbeing. The 66-year-old made the decision to open up and reveal to PEOPLE Magazine that he was living with Dementia.

He admits to being in denial

Cassidy was in denial of having dementia though he knew the disease ran in his family as both his mother and grandfather had also been diagnosed with it. “I was in denial, but a part of me always knew this was coming,” he revealed.

David Cassidy witnessed his grandfather battle dementia for years. He also explained watching his mother “disappear” thanks to the disease up until she died at the age of 89 years old.

His fans already knew he was retiring

The singer had made the decision to retire – and announced his decision earlier this month – after five decades of performing. He told PEOPLE Magazine that he needed to retire from the entertainment industry so he could focus on his health.

“I want to focus on what I am, who I am and how I’ve been without any distractions. I want to love. I want to enjoy life,” he explained.

He has had a share of ups and downs

This entertainer is no stranger to personal ups and downs. During his lifetime, he’s been charged with three DUIs including one in November of 2010, one in August of 2013, and one in January of 2014.

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Just a month after his third arrest, Sue Shifrin-Cassidy filed for divorce. A year later he filed for bankruptcy before being charged with a hit-and-run eight months after that.

David even struggled with a substance addiction with resulted in a stay at rehab in 2014. Battling dementia will just be another bullet to add to his list of personal ups and downs.