Castle Season Six Spoilers: 'Hustler' Show To Jeopardize Rick Castle and Kate Beckett's Dream Wedding.

New casting of the season finale episode of Castle advocates that Castle (Nathan Fillion) and Detective Kate Beckett (Stana Katic) might not have the wedding their expecting to have.

Eddie McClintock (Warehouse) has been casted to play in Castle season finale,which has been confirmed, "For Better or For Worse", which is intriguing new role. The actor will guest in the season finale episode as Rogan O'Leary, "a small town hustler" known for scheming who has 'complicated' past with Beckett.

Though there are no reports or further details about Rogan's complicated past with Beckett. he could definitely be a potential risk factor in Castle and Kate's big wedding day. 

Writer and producer, Andrew W. Marlowe of Castle, had previously stated what he has in stored for Castle and Beckett's wedding draws even closer.

"What I'll say is we're trying to present a couple who are in the process of planning a wedding, and things get talked about, and things come up as you get close to the date," Marlowe revealed to Give Me My Remote in March. "We think it would be unfair not to talk about it, not to show it, because it is very much a part of their lives."

Before the big day, Castle and Beckett will be solving a few more cases that are rarely unusual and intriguing. 

That '70s Show and features the pair grilling a man connected with a '70s mobster. Episode 21 is titled Law & Boarder, a clever spin on the NBC crime drama Law & Order, and episode 22 is titled Veritas, a Roman word that translates to "truth."