David Letterman's final 'Late Show' will be May 20

David Letterman's final broadcast of "The Late Show" will air Wednesday, May 20, CBS announced. In April, the legendary host took everyone (including his network and staff) by surprise when he told his audience during a broadcast that he would retire in 2015. His reasons were long and complicated, but basically, his heart wasn't in it after three decades in late-night television.