May 20 Last Late Show

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David Letterman's last "Late Show" appearance after decades as host will be on May 20, CBS television said Wednesday.

"David Letterman has given to all of us a remarkable legacy of achievement and creative brilliance that will never be forgotten," according to Leslie Moonves, president of CBS.

But keep in mind that before David Letterman, Conan O'Brien, Jay Leno, Arsenio Hall, Jimmy Kimmel, Jimmy Fallon, Craig Ferguson and others, there was one undisputed king of late night comedy: Johnny Carson. He reigned over The Tonight Show brand for 30 straight years, 1962-1992, and was the greatest TV host of all time.

The 67-year-old Letterman announced back in April that he would retire from the "Late Show." Comedian Stephen Colbert, known for his political satire, will be the veteran's successor.