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Castle

Spoiler Photos of Castle Season 4, Episode 21: “Headhunters”

"With tensions rising between ;Castle ;and ;Beckett, Castle finds himself a new partner — Detective Ethan Slaughter (guest star Adam Baldwin, Firefly), a tough and colorful cop from the city's gang unit. But Castle gets more than he bargained for when Slaughter shows him a grittier side of police work that puts Castle in the line of fire like never before."

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Original Air Date: ;Castle ;Season 4, Episode 21: "Headhunters" airs on Monday, April 16, 2012 at 10 p.m. ET on ABC.

04.3.2012 / 10:42 PM EDT by Wetpaint Staff
Related: Castle, Richard Castle, Kate Beckett

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