NEW YORK (AP) - David Letterman considered himself a friend of Robin Williams, as well as a comedy colleague. And he says even as someone who has known Williams for decades, he didn't see his death coming, especially as it did by his own hand. Letterman says he had no idea Williams was in so much emotional pain - even as he was being one of the funniest people on the planet. Letterman paid tribute to Williams on his show Monday night - a week after the world learned of his suicide. Letterman talked about how a group of comedians working the Comedy Store in Los Angeles thought they might have to find another line of work after hearing Williams perform as a newcomer.
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