From The TV IV
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Knockout is the twenty-fourth episode of the third season of Castle, and the fifty-eighth 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)
Guest Starring: Scott Paulin (Jim Beckett), Priscilla Garita (Bridge Officer), George Gerdes (Mike Yanavich), Sean Blodgett (Avery Zussman), Matt McTighe (Chuck Ryker), Brian Goodman (Gary McCallister), Max Martini (Hal Lockwood)
Lockwood, the assassin captured in Knockdown, kills other cop who knew about the murder of Beckett's mother, then escapes from prison.