(CBS) – David Letterman is calling it a night.

The longtime late-night talk show host stunned his studio audience and his many fans Thursday with the announcement tonight that he’ll retire next year.

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Letterman brought his brand of humor to CBS back in 1993 after hosting his “Late Night” show on rival NBC.

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At Chicago’s Second City — a virtual factory for top comedians — the question is posed: Who’s up next?

“Jimmy Fallon, Seth Meyers, it’s completely open. There are so many talented people in that realm, in that community,” says marketing director Robin Hammond.

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