When did Castle Season 4 Episode 21 air?
Castle Season 4 Episode 21 aired on April 16, 2012.
Castle
A whole new chapter in crime solving.
After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New York City to tag along with an NYPD homicide investigation team for research purposes.
Created by: Andrew W. Marlowe
Season 4 · Episode 21
Headhunters
Apr 16, 2012·44m
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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Direct answers for episode-level questions and details.
How long is Castle Season 4 Episode 21?
This episode runs for approximately 44 minutes.
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