The hosts of NBC's iconic late-night talk show over the past several decades.

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Comedian and original host of NBC's 'Tonight Show', Steve Allen died of heart failure October 30, 2000 at his son's Encino, Ca. home according to sources close to the family. Allen was also a song writer and composed more than 4000 tunes. In addition, he wrote 40 books throughout his career.

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Talk show host Johnny Carson, right, is showm with the show's announcer Ed McMahon during the final taping of the "Tonight Show" in Burbank, Ca. (May 22, 1992)

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In a photo made from a monitor screen in the NBC studio, comedian Jack Paar tells his studio and television audience that he is quitting his nationwide late evening television show. (Feb. 11, 1960)

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Conan O'Brien makes his debut as the host of NBC's "The Tonight Show" in Universal City, Calif. (June 1, 2009)

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Jay Leno hosted his last "Tonight Show" on Feb. 6, 2014 after 22 years at the desk (30-plus, counting the substitute host ones).

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Jimmy Fallon took over "Tonight" from Leno on Feb. 17, 2014. "Saturday Night Live" cast member Seth Meyers replaced Fallon as host of "Late Night."

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