A rookie and a seasoned no-nonsense cop are at the center of this police drama set in Los Angeles.

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Season 4, Episode 1 Wednesday

First Aired: January 17, 2012

Season 4 opens with John returning to work after recuperating from back surgery and meeting his no-nonsense new partner, Jessica Tang (Lucy Liu). Elsewhere, Lydia also gets a new partner; an armed man is pursued into an elementary school; and Ben tangles with a cynical street cop.

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Guest Cast