"Castle" season 6, episode 23 spoilers seem to point to a cataclysmic event involving masked men, bikers and craziness in between. The season finale, called "For Better or for Worse" could end with a major cliffhanger as Castle and Beckett are celebrate their wedding.

Stana Katic, who plays Kate Beckett, has revealed in a Twitter post that somebody will die in the show before the season winds down, Christian Post reported.

"S6 finale had us saying goodbye to a number of colleagues today. Lucky to work with these incredibly talented actors."

In an earlier Twitter post, she wrote: "Last day of filming ... Thank you everyone for watching! All the best, Stana."

The official "Castle" season 6, episode 23 spoilers reads: "Castle and Beckett's long-awaited wedding is almost here, but when a shocking surprise threatens to ruin the big day, they are sent on a wild mission filled with masked men, angry bikers and a charming ne'er-do-well from Beckett's past (guest star Eddie McClintock, "Warehouse 13")."

The season finale will also show quite a bit of a contest between Javier Esposito and Kevin Ryan on who will become Richard Castle's best man.

Nathan Fillion, who plays Richard Castle, revealed to TV Guide that Eddie McClintock's character, Rogan, has many flaws but a long history with Beckett. Rogan's character, he said, "is unlikable by anyone's standards."

It's not clear, however, what role Rogan has to play to disrupt the wedding if it ever happens at all in "Castle"season 6, episode 23, even if Nathan Fillion said that Richard Castle will make a better husband now compared to when he was young which explains why he is twice-divorced.

Finally, Nathan Fillion dished out on some "Castle" season 6, episode 23 spoilers of his own, saying:

"There's a big cliffhanger and it's a good one."

"Castle" season 6, episode 23 airs on ABC Mondays at 10 p.m. EST.