David Letterman knew Robin Williams for 38 years, and remembers him as a "very talented man and a good friend and a gentlemen."
On Monday's Late Show, the host paid tribute to his fellow comedian by showing clips of him on the CBS program and a personal photo of himself posed with Williams, Richard Pryor and Comedy Store owner Mitzi Shore.
Letterman went on about the Oscar winner's immense talent, recalling seeing him perform stand-up back in the day. "All of a sudden he comes up on the stage and -- you know what it is -- it's like nothing we had ever seen before, nothing we had ever imagined before. And then he finishes and I thought, 'Oh that's it, they're gonna have to put an end to show business because what could happen after this?'" he said. "Honest to God you thought, 'Holy crap, there goes my chance in show business because of this guy.'"
Becoming a bit emotional, the 67-year-old host added, "What I will add here is beyond being a very talented man, and a good friend and a gentleman ...I'm sorry, like everybody else, I had no idea that the man was in pain, that the man was suffering, but what a guy."
Williams passed away on Monday, August 11, of an apparent suicide. He was 63. The actor/comedian was on the Late Show 50 times.
Williams' wife revealed later that week that her husband was suffering from Parkinson's Disease.
Watch the video to see ET's own vintage footage of Robin before one of his appearances on Late Show.
You Might Also Like(Sponsored)
Star Styles At The AMAs Red Carpet
The Sexiest Pics Ever of Sexiest Man Alive Chris Hemsworth
OUCH: Jennifer Lopez Probably Isn't Too Happy She Made This List
WOW: Is Matt Lauer Fighting With Hoda Kotb? Fox News
Robert Pattinson Sure Does Have an Amazing Girlfriend Fishwrapper
Why Is This Man Other Than Brad Pitt Kissing Angelina Jolie? Fox News
See How Brandi Glanville Hits Back at LeAnn Rimes' Bikini Pics Fishwrapper
Demi Moore's Daughter Just Shaved Her Head Fox News
Bill Cosby Makes New Comments on Accusations
Janice Dickinson Op-Ed: 'The Only Way To Stop This Is To Be Really Vocal'
Diplo Responds to Lorde's Diss of His Manhood
Charlie Sheen Sends Waiter $1000 Dollars After NFL Player Tips 20 Cents
Every Single Outfit Taylor Swift Wears in Her 'Blank Space' Video
Accuser to Bill Cosby: Take Up For Women, Try to Do Something Heroic