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LIVE TWITTER CHAT WITH "CASTLE" STAR SEAMUS DEVER SET TO TAKE PLACE ON MONDAY, JANUARY 9

Fans of ABC's hit drama series "Castle" will be able to submit questions and receive real-time responses from actor Seamus Dever (Kevin Ryan), who will be up on Twitter at @seamusdever, during the West Coast broadcast of the show on MONDAY, JANUARY 9 from 10:00-11:00 p.m., PT. Seamus will also offer commentary and behind-the-scenes anecdotes about working on the show.

In that night's episode, "'Till Death Do Us Part," after 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 Kevin's wedding with Jenny (Dever's real-life wife, Juliana Dever, guest stars). For more on their upcoming wedding: http://www.duffyomalleyandryan.ourwedding.com

"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. A TV parental guideline will be assigned closer to airdate.

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