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View Gallery "Knockout" Photos (20)

CASTLE - "Knockout" - Kate Beckett's investigation into her mother's death is reactivated when Hal Lockwood (guest star Max Martini, "The Unit") - a professional hitman with knowledge of Beckett's mother's murder - stages a spectacular escape during a court hearing. As police launch a manhunt for Lockwood, Castle and the team uncover evidence of a deeper conspiracy involving a mysterious figure with law enforcement connections who is linked to both Lockwood's escape and the killing of Johanna Beckett. The search for Lockwood and the quest to identify his co-conspirator leads to a shocking and deadly conclusion, on the Season Finale of "Castle," MONDAY, MAY 16 (10:01-11:00 p.m., ET) on the ABC Television Network. (ABC/PETER "HOPPER" STONE)STANA KATIC

Season 4

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Episode 23 18 photos
Episode 11 9 photos

Character Galleries

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Kate Beckett 423 photos
Richard Castle 470 photos
Alexis Castle 73 photos
Javier Esposito 89 photos

Roy Montgomery 17 photos
Lanie Parish 39 photos
Martha Rodgers 48 photos
Kevin Ryan 85 photos

Additional Character Galleries

Gina Griffin 13 photos
Tom Demming 19 photos
Madison Queller 6 photos
Jordan Shaw 12 photos

Themed Galleries

Castle's Coolest Cases 10 photos
Dad Moments 12 photos
Vampire Weekend: Behind the Scenes 7 photos

Castle & Beckett Moments

Season 1 Moments 5 photos
Season 2 Moments 13 photos