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A woman is found murdered in Central Park and the investigation links her death to a serial killer. Meanwhile, Mac reconnects with his first partner (Peter Fonda) after an ex-con the two put in prison begins stalking them. The NFL's Rex Ryan and Mike Tanne (more…)
Jamie refuses to shun a cop who testified against her partner, earning him disapproval from Eddie and other officers. Elsewhere, Erin and Danny get into a dispute when a closed case leads to a new murder; and a sports celebrity visits Frank.
Nick and Hank investigate a double homicide that's linked to the Verrat. Meanwhile, Trubel meets a father-and-son team who traveled a great distance to find "the Portland Grimm"; and Renard grows suspicious of Adalind's behavior.