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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) NATHAN FILLION