Katie and Shaun Cassidy Pay Tribute to the Late David Cassidy on What Would Have Been His 75th Birthday David Cassidy Remembered by Brother Patrick on What Would've Been His 74th Birthday ...

David Cassidy: The Last Session' airs Monday night on A&E. The late actor opened up about his health decline in a new documentary, 'David Cassidy: The Last Session,' premiering June 11 on A&E Network.