Castle/Under the Gun
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Under the Gun is the third episode of the third season of Castle, and the thirty-seventh episode overall.
Starring: Nathan Fillion (Richard "Rick" Castle), Stana Katic (Detective Kate Beckett), Susan Sullivan (Martha Rogers), Ruben Santiago-Hudson (Captain Roy Montgomery), Molly Quinn (Alexis Castle), Jon Huertas (Detective Javier Esposito), Tamala Jones (M.E. Lanie Parish), Seamus Dever (Detective Kevin Ryan)
Beckett and Castle investigate the death of a bounty hunter found shot dead in his office. While following a suspect they run into Mike Royce, Beckett's old trainer who left the NYPD and now works as a bounty hunter.