Bill Murray to celebrate 20 years of "Late Show with David Letterman"

Bill Murray tells the audience not to scream after lighting thirty birthday candles in a cupcake as a gift to Late Show host David Letterman for his Thirty years in television during the Tuesday Jan. 31, 2012 taping of the Late Show with David Letterman on the CBS Television Network Photo: John P. Filo/CBS

He was there from its inception, and Bill Murray will be back again when the "Late Show with David Letterman" celebrates its 20th anniversary on CBS.

The network announced on Monday that Murray will appear as a guest Thursday on the late-night program, marking two decades since Mr. Letterman first joined CBS.

The folks at the "Late Show" toasted the announcement on Twitter:

The Oscar-nominated actor and "SNL" alum, who will next star in George Clooney's "The Monuments Men" in December, was the very first guest on the "Late Show" when it first premiered on Aug. 30, 1993. Murray was also Letterman's first guest over 30 years ago on his predecessor series, "Late Night" on NBC, in 1982.

This upcoming guest spot will mark Murray's 26th appearance on Letterman's show, which has won nine Emmy Awards over the years. The Aug. 29 broadcast will mark the series' 3,897th episode (in addition to four primetime specials).

Now in its 21st season, the "Late Show with David Letterman" airs weeknights at 11:35 p.m. ET on CBS.

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    Ken Lombardi is an entertainment reporter for CBS News. He has interviewed over 300 celebrities, including Clint Eastwood, Oprah Winfrey and Tom Hanks.