Conan O'Brien, Jimmy Fallon Give Emotional Tributes to Robin Williams

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Late-night television was a little light on the laughs Tuesday night as the hosts paid their respects to Robin Williams.

Jimmy Fallon fought back tears on the Tonight Show as he recalled watching Williams' stand-up, and encouraged his audience to look up the performances on YouTube. He even did an impression of the late actor/comedian.

"He was funny and he was fast and he would weave in and out of characters. And you'd watch him and you would cry laughing, and you would think, 'I'm never going to see anyone like this human ever!'" Fallon said. "O Captain, my captain. you will be missed."

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The host also aired Williams' first appearance on the Tonight Show with Johnny Carson in 1981.

Fallon's fellow NBC host Seth Meyers also addressed Williams' death on Late Night. "The saddest part of this is Williams was battling depression, and if there is anything we can do to honor his memory I would hope it would be to use this opportunity to educate us more about this terrible affliction," he said. "So we just want to say that we miss Robin, but we’re also very lucky to have had him at all."

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Though Jimmy Kimmel was not taping new shows, he did tweet similar sentiments to that of Meyers. He wrote: "Robin was as sweet a man as he was funny. If you're sad, please tell someone."

On Monday, Conan O'Brien broke the news of Williams' death to his live audience during a taping, but paid tribute once again to his friend on Tuesday's program. The host recalled when the Oscar winner bought him a bike to cheer him up during his departure from the Tonight Show and NBC in 2010.

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"A bunch of years ago I went through, publically, a little bump in the road and I was feeling a little low," O'Brien began. "Out of the blue, Robin Williams buys me a bicycle. I was kind of low, and this is so Robin Williams -- it was the most absurd bright orange and bright green bicycle with shamrocks on it."

"So I called him up and all he could say was, 'Does it look ridiculous? Will you look stupid riding it?' He had just that amazing spirit of fun."

Williams passed away on Monday in his California home of an apparent suicide. He was 63.