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Spoiler Clip of Castle Season 4, Episode 21, "Headhunters": Beckett Fears for Castle's Safety

Things get dicey (and bloody!) when Rick Castle ditches Detective Beckett for Detective Slaughter. Kate says it best: "You're a writer, Castle, not a cop!" Will Rick heed Kate's advice before Slaughter puts him in real danger?


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

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