Preview Clip: Castle Gives Detective Slaughter His Brown Coat in Castle Season 4, Episode 21: "Headhunters" (VIDEO)
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We're sorry, Castle, we can't hear you over all those Firefly references.
Original Air Date: Castle Season 4, Episode 21: "Headhunters" airs on Monday, April 16, 2012 at 10 p.m. ET on ABC
