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