One week after Robin Williams' death, David Letterman devoted a segment of his talk show to paying tribute to the late actor and comedian. It's both funny, and touching. ('The Late Show' was on hiatus last week when news of Williams' suicide broke.)

After a heartfelt tribute to his friend of 38 years, Letterman played clips from several of Williams' appearances on his show. Letterman even poked fun at himself as he trotted out footage from his cameo on 'Mork and Mindy'.

As he wrapped up the segment, Letterman noted what so many have been thinking this last week.

"What i will add here is that, beyond being a very talented man and a good friend and a gentleman, I am sorry. I, like everybody else, had no idea that the man was in pain and the man was suffering."

- George McIntyre
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