TV-Letterman Retiring

FILE - This Jan. 15, 1993 file photo shows talk-show host David Letterman announces his new contract with CBS television for his new show "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/Alex Brandon, File)