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Aisha Tyler, best known as a comedian, will branch out into more serious roles on two Emmy-nominated dramas this season.

Tyler, who did a guest turn on FX’s “Nip/Tuck” earlier this summer, has signed on for guest-starring arcs on CBS’ “CSI” and Fox’s “24.” She’ll appear in at least three episodes of each show, with an option for more.

“Both ’24’ and ‘CSI’ are great shows, and I’m a huge fan of both,” Tyler told The Hollywood Reporter. “It was an opportunity to do something very, very different because not only are they dramas, but the characters are very different from any characters I’ve played in the past.”

On “CSI,” Tyler will play a scientist who joins Gil Grissom’s (William Petersen) forensic team. It’s not her first foray into the “CSI” world; she had a guest role on “CSI: Miami” during that show’s first season, playing a prosecutor.

When “24” returns early next year, Tyler will be featured as a data analyst at the Counter Terrorism Unit.

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Edited by Cara DiPasquale ([email protected]) and Victoria Rodriguez ([email protected])