"David Letterman greets San Francisco mayor Willie Brown on  opening night of the show's filming in San Francisco. During a taping of his show Thursday, April 3, 2014, Letterman said he has informed his CBS bosses that he will step down in 2015, when his current contract expires. He told his audience he expects his departure will be ""at least a year or so"" from now. Photo: TONY ESPARZA, PHOTOG & CBS"
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