Michael Ausiello
July 20, 2009 AT 07:51 PM EDT

I smell a 2010 guest actress Emmy nod in Erika Christensen’s future.

The ex-Six Degrees star has been tapped to play a law student suffering from multiple personality disorder in the season premiere of Fox’s Lie to Me, sources confirm to me exclusively.

Her character, Tricia, comes to Lightman (Tim Roth) for help when she has a psychic vision of a murder. During his investigation, Lightman discovers that Tricia is actually Sophie. And Jessie. And R.J.

Christensen’s schedule opened up after NBC postponed the start date of her new drama, Parenthood, by eight weeks as Maura Tierney undergoes surgery to remove a tumor in her breast.

Lie to Me‘s second season kicks off on Sept. 28.

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