Law & Order: Special Victims Unit: Season 9, Episode 12

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Detectives Benson and Lake investigate the murder of a female alongside a man with a bullet inside his head; they soon team up with Special Agent Cooper (Erika Christensen), who's tracking a serial killer by the name of "The Woodsman", but things turn weird when the male victim is identified as the serial killer and Special Agent Cooper seems to be hiding something of her own.