It was confirmed after his death that the actor suffered from diffuse Lewy body dementia. He still managed to leave a mark in the entertainment world due to his roles in Good Morning Vietnam, Jumanji and Mrs. Doubtfire
Zak Williams has surely made his father proud. After his death in 2014, Zak became a mental health advocate. He regrets not spending more time with his dad during those times. "I think that was a very lonely period for him". Surely the actor would be happy to know his grandson is named after him!