CSI: Meet Gil Grissom's Mom

Tony winner Phyllis Frelich will guest-star on CSI as Gil Grissom's mother, Entertainment Weekly reports.

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Frelich will appear in the Feb. 3 episode, which revolves around a murder at a school for the deaf, where Grissom's mother is a professor. Mrs. Grissom will butt heads with the newest Mrs. Grissom — Sara (Jorja Fox), Gil's wife — who works the case. It turns out Mama Grissom has another woman in mind for her son: her protégé and Gil's ex, to be played by Marlee Matlin.

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William Petersen, who left the show two seasons ago, will not reprise his role as Grissom in the episode.
Frelich, who is deaf, won a Tony for her work in the 1980 Broadway production of Children of a Lesser God. The 1986 film adaptation of the play won Matlin an Oscar for her performance.
An email to CBS was not immediately returned.