Ten years ago on Sunday, the laughter stopped. In a beautiful waterfront home in Paradise Cay, California, , unwilling to contend with the increasingly debilitating impact of Lewy body dementia. He was 63.

It was impossible to experience Williams − a what Taylor Swift is to music: uncategorizable − and not have that experience leave a lasting impact. Just ask Matt Damon. "Robin, wow," Damon says softly when asked about the comedy legend while promoting his new Apple TV+ heist movie co-starring Casey Affleck and Hong Chau.

"He was a very deep, deep river." Damon met Williams in 1997 while filming "Good Will Hunting." As therapist Sean Maguire, Williams was tasked with breaking down the psychological walls erected by Damon's math savant Will Hunting.

Williams' fearless performance won him the 1998 best supporting actor Oscar. "So I just realized, here are two movies that are pro-therapy: 'Good Will Hunting' and 'The Instigators,' " says Damon, referring to Chau's therapist character who works against great odds to reach both Damon and Affleck's troubled characters. "Undergirding both movies are positive messages about therapy, which Robin handled so beautifully.

" In "Hunting," finds Williams challenging Damon's brash character to dig deeper. The two are sitting on a park bench in the Boston Public Garden. Williams' voice is a whisper but his message lands like a hammer.

"You don't know about real loss," says Williams, talking about his wife who died from cancer. "Because th.