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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 Castle), Stana Katic (Detective Kate Beckett), Susan Sullivan (Martha Rodgers), 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: Max Martini (Hal Lockwood), Scott Paulin (Jim Beckett), Brian Goodman (Gary McCallister), Judith Scott (Evelyn Montgomery), Matt McTighe (Chuck Ryker), George Gerdes (Mike Yanavich), Malcolm Foster Smith (Dwight Haskell)
Lockwood, the assassin captured in Knockdown, kills the other cop who knew about the murder of Beckett's mother, then escapes from prison.