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Has Parker Posey every played in a Colin Firth movie before?
In “The Staircase,” which was based in part on a docuseries of the same name, Parker Posey plays the late Freda Black, the assistant district attorney in the murder trial of Michael Peterson (Colin Firth), a wealthy North Carolina writer whose wife, Kathleen (Toni Collette), was found dead at the bottom of their mansion stairs.…