Former talk show host Johnny Carson, with his (Credit: NBC)

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.

Photos: King of late night

Johnny Carson and kings of late night.

Johnny Carson pays a visit to David Letterman
(Credit: NBC)

Johnny Carson pays a visit to David Letterman on Late Night.

Former talk show host Johnny Carson, with his
(Credit: NBC)

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.
(Credit: NBC)

Johnny Carson on The Tonight Show.

Johnny Carson in 1957.
(Credit: NBC)

Johnny Carson in 1957.

Johnny Carson on The Tonight Show for the
(Credit: NBC)

Johnny Carson on The Tonight Show for the NBC 75th anniversary.

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Jay Leno and David Letterman on the set
(Credit: NBC)

Jay Leno and David Letterman on the set of The Tonight Show, April 28, 1977.

Johnny Carson and David Letterman on the set
(Credit: NBC)

Johnny Carson and David Letterman on the set of The Tonight Show, Nov. 24,1978.