David Letterman through the years

FILE In this June 29, 2010 file photo released by CBS, host David Letterman kisses the hand of country music singer Dolly Parton on the set of the "Late Show with David Letterman" in New York. Letterman announced his retirement during a taping on Thursday, April 3, 2014. Although no specific date was announced he told the audience that he will leave his desk sometime in 2015. (AP Photo/CBS, Heather Wines, File) MANDATORY CREDIT; NO SALES; NO ARCHIVE; NORTH AMERICAN USE ONLY

FILE In this June 29, 2010 file photo released by CBS, host David Letterman kisses the hand of country music singer Dolly Parton on the set of the "Late Show with David Letterman" in New York. Letterman announced his retirement during a taping on Thursday, April 3, 2014. Although no specific date was announced he told the audience that he will leave his desk sometime in 2015. (AP Photo/CBS, Heather Wines, File) MANDATORY CREDIT; NO SALES; NO ARCHIVE; NORTH AMERICAN USE ONLY

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