FILE - This May 30, 2012 file photo shows married actors Carrie Preston, left, and Michael Emerson at the premiere of HBO's "True Blood" in Los Angeles. 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. (Photo by Matt Sayles/Invision/AP, file)

Associated Press
FILE - This May 30, 2012 file photo shows married actors Carrie Preston, left, and Michael Emerson at the premiere of HBO's "True Blood" in Los Angeles.  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. (Photo by Matt Sayles/Invision/AP, file)
FILE - This May 30, 2012 file photo shows married actors Carrie Preston, left, and Michael Emerson at the premiere of HBO's "True Blood" in Los Angeles. 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. (Photo by Matt Sayles/Invision/AP, file)
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