Who's replacing Costas?


Bob Costas is stepping down from his role as prime-time host of NBC's Olympics coverage, where he will be replaced next winter in South Korea by Mike Tirico. Costas has been the on-air concierge to NBC's Olympics 11 times, starting in 1992. He warmed up as the late-night host in Seoul in 1988. Costas, 64, said he's not retiring from the business, but entering the "Tom Brokaw phase" of his career.

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