WHEN A BACHELOR PLUMMETS TO HIS DEATH AFTER A ONE-NIGHT STAND, THE INVESTIGATION LEADS TO A SHOCKING DISCOVERY THAT MIGHT DERAIL RYAN'S WEDDING, ON ABC'S "CASTLE"

"'Till Death Do Us Part" - When a lothario is killed, Castle and Beckett suspect that the victim's mysterious double life holds the key to his murder. Their investigation leads to a shocking twist that threatens to disrupt Ryan's wedding with Jenny (Seamus Dever's real-life wife, Juliana Dever, guest stars), on "Castle," MONDAY, JANUARY 9 (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, Penny Johnson Jerald as NYPD Captain Victoria Gates, Tamala Jones as Medical Examiner Lanie Parish, Jon Huertas as NYPD Detective Javier Esposito, and Seamus Dever as NYPD Detective Kevin Ryan.

Guest Cast: Juliana Dever as Jenny Duffy-O'Malley, Sam Hennings as Seth Harris, Jaime Ray Newman as Holly Franklin, Daniel Romer as Cute Young Guy, Haley Strode as Hot Young Woman.

"'Till Death Do Us Part" was written by David Grae and directed by Jeff Bleckner.

"Castle" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1 channel surround sound. This program carries a TV-PG,D,L,V parental guideline.

For more information on "Castle," visit ABC.com/Castle