Credit: Adam Larkey/ABC Television Group © 2011 Disney Photo: Castle Goofs Around in Season 4, Episode 11: “Til Death Do Us Part”

We just got our hands on this official Castle episode synopsis for Season 4, Episode 11, "Till Death Do Us Part." Keep reading for all the juicy details, and remember the episode airs January 9, 2012 at 10 p.m. ET on ABC!

"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," reads ABC's press release.

"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).

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.

Source: SpoilerTV

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