Photos: King of late night
Johnny Carson and kings of late night.
Johnny Carson pays a visit to David Letterman on Late Night.
Former talk show host Johnny Carson, with his personalized coffee cup in front of him, watches clips from earlier shows during the last taping of "The Tonight Show" in Burbank, Calif., on May 22, 1992.
Johnny Carson on The Tonight Show.
Johnny Carson in 1957.
Johnny Carson on The Tonight Show for the NBC 75th anniversary.
Jay Leno and David Letterman on the set of The Tonight Show, April 28, 1977.
Johnny Carson and David Letterman on the set of The Tonight Show, Nov. 24,1978.