SEASON FINALE

AFTER HAL LOCKWOOD ESCAPES, CASTLE & BECKETT ARE ON THE HUNT FOR HIM, AS WELL AS THE IDENTITY OF A DIRTY COP TIED TO THE MURDER OF BECKETT'S MOM, ON THE EXPLOSIVE SEASON FINALE OF ABC'S "CASTLE"

Max Martini Returns

"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.

"Castle" stars Nathan Fillion as Richard Castle, Stana Katic as NYPD Detective Kate Beckett, Susan Sullivan as Martha Rodgers, Molly Quinn as Alexis Castle, Ruben Santiago-Hudson as NYPD Captain Roy Montgomery, Tamala Jones as Medical Examiner Lanie Parish, Jon Huertas as NYPD Detective Javier Esposito, and Seamus Dever as NYPD Detective Kevin Ryan.

Guest Cast: Max Martini as Hal Lockwood, Brian Goodman as Gary McCallister, Scott Paulin as Jim Beckett, Matt McTighe as Chuck Ryker.

"Knockout" was written by Will Beall and directed by Rob Bowman.

"Castle" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1 channel surround sound. A TV parental guideline will be assigned closer to airdate.

For more information on "Castle," visit ABC.com. Viewers can also follow the show via http://facebook.com/Castle and Twitter: Castle_ABC