Thank you for the abundance and support you have shown him these many years.

He was also suffering from dementia.

It wasnt hard for Cassidy to get into character onThe Partridge Family.

Photo of Partridge Family

Michael Ochs Archives/Getty Images

Though the sitcom was beloved by fans, the handsome Cassidy was one of the shows biggest draws.

Hundreds more were injured.

Im an optimist, Cassidy was quoted as saying.

I mean, you have to be with my career.

Ive never gone out and changed my style to suit the times.

He taught me to be fearless about revealing the frailties and strengths of the human experience.

Bringing that human element to my work is the most important thing I can do as an entertainer.

In 2011, he starred onCelebrity Apprenticebut was the first to be fired by Donald Trump.

He filed for bankruptcy in 2015, the same year he wascharged with a hit-and-run in Florida.

He also received several DUIs, which led him to publicly admitting he was battling alcoholism.

Offstage, Cassidy became a spokesperson for various Alzheimers organizations since his mother died from severe dementia.

Earlier this year, he told PEOPLE he wassuffering from the same disease.

I was in denial, but a part of me always knew this was coming, he said.