Just found this little teaser titbit on line:
Melissa George will guest-star in at least two episodes of FOX's Lie to Me as an adversary for Tim Roth's character, TVGuide.com has confirmed.
George (Grey's Anatomy, Alias) will play Clara Martin, the sassy younger wife of a murdered billionaire. After being exonerated for the murder, Clara assumes control of her husband's empire. Though she goes toe-to-toe with Lightman (Roth), they bond over their shared eccentricities.
George, whose casting was first reported by Entertainment Weekly, will first appear in Episode 11.