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Laura Prepon to guest star on 'Castle' as 'Nikki Heat' actress

10/29/2010 by Corinne Heller

Laura Prepon in a scene from 'In Plain Sight'. (Photo courtesy of Universal Cable Productions / USA Network) Laura Prepon of That '70s Show is set to guest star on the ABC mystery series Castle as Natalie Gray, an actress who will play fictional heroine Nikki Heat in a film adaptation of protagonist Richard Castle's crime novels that will be depicted on the show.

Castle, played by Nathan Fillion, based his character Heat on Kate Beckett, a New York detective played by Stana Katic. The two have worked together to solve crimes since he initially asked to shadow her for research purposes.

Prepon, 30, is set to appear in a Castle episode in early 2011, an ABC spokesperson said. Her character, Gray, will travel to New York and shadow Castle and Beckett during a case, which revolves around the murder of a millionaire matchmaker.

Castle is currently on its third season.

Prepon shot to fame playing red-headed Donna on the sitcom That '70s show, which also launched the careers of Ashton Kutcher and Mila Kunis. The series ran from 1998 to 2006. Prepon has since guest starred on House, M.D., How I Met Your Mother and In Plain Sight.

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