In the new Biography documentary special, 'David Cassidy: The Last Session,' which airs Monday at 9/8c on A&E, Cassidy admitted to lying about having dementia to hide the fact that he had a drinking problem. The former teen idol died in November 2017 from organ failure. “I did this to myself,” he said.

Outlaw Butch Cassidy, also known as Robert Leroy Parker, partnered with the Sundance Kid to rob banks and trains in the early 1900s.

Shaun Cassidy became a pop music sensation in the 1970s, much like his older half-brother David Cassidy. His first two albums sold more than 5 million copies.

Ted Cassidy was a 6’9” American actor known for his work in The Addams Family TV series and the film Butch Cassidy and the Sundance Kid.