In this image released by CBS, David Letterman appears during a taping of his final "Late Show with David Letterman," Wednesday, May 20, 2015, at the Ed Sullivan Theater in New York. (Jeffrey R. Staab/CBS via AP) ** FILE **
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In this image released by CBS, David Letterman appears during a taping of his final "Late Show with David Letterman," Wednesday, May 20, 2015, at the Ed Sullivan Theater in New York. (Jeffrey R. Staab/CBS via AP) ** FILE **
