This undated image released by CBS shows Michael Emerson, left, and Carrie Preston in a scene from "Person of Interest." Emerson has played a serial killer, a mysterious, villainous Island leader and currently stars as a billionaire computer genius on “Person of Interest.” But he says playing the romantic interest for his real life wife has been his most unsettling role. Emerson plays the off-beat Harold Finch in “Person of Interest,” which airs Thursdays at 10 p.m. Eastern. His wife Carrie Preston has a recurring role as Finch's former fiance, who believes he is dead. (AP Photo/CBS, John Paul Filo)

Associated Press
This undated image released by CBS shows Michael Emerson, left, and Carrie Preston in a scene from "Person of Interest."  Emerson has played a serial killer, a mysterious, villainous Island leader and currently stars as a billionaire computer genius on “Person of Interest.” But he says playing the romantic interest for his real life wife has been his most unsettling role. Emerson plays the off-beat Harold Finch in “Person of Interest,” which airs Thursdays at 10 p.m. Eastern. His wife Carrie Preston has a recurring role as Finch's former fiance, who believes he is dead. (AP Photo/CBS, John Paul Filo)
This undated image released by CBS shows Michael Emerson, left, and Carrie Preston in a scene from "Person of Interest." Emerson has played a serial killer, a mysterious, villainous Island leader and currently stars as a billionaire computer genius on “Person of Interest.” But he says playing the romantic interest for his real life wife has been his most unsettling role. Emerson plays the off-beat Harold Finch in “Person of Interest,” which airs Thursdays at 10 p.m. Eastern. His wife Carrie Preston has a recurring role as Finch's former fiance, who believes he is dead. (AP Photo/CBS, John Paul Filo)
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