Have a look at a sampling ofreactionposted on social media below.
He also appeared in a half-dozen Broadway shows.
My friend Treat was aptly named and occupied his chair so well.

Treat Williams in 2019Getty Images
I will miss him but I will not forget him.
Well done, my friend.
So honored when Treat Williams signed on to deliver our own, later critique of the disaster.

RIP to a legendary actor and a fine, gracious man.
Treat Williams was a passionate, adventurous, creative man.
In a short period of time, he quickly befriended me & his adventurous spirit was infectious.
We worked on just 1 film together but occasionally connected over the years.
Kind and generous with advice and support.
This is breaking my heart.
Treat Williams rest in peace.
One of the truly nicest guys Ive ever met!
My prayers go out to Treats family…what a loss.
Ill miss seeing him.
Let the sunshine in and rest well, Treat Williams.
It’s such an incredibly naked, genuine, passionate performance.