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The Castle Couple Who Couldn't Stand Each Other In Real Life

The history of TV and movies is filled with actors who played best friends or spouses on the screen but could not stand each other in real life. But some onscreen duos are so believable and convincing on screen that it can be hard, if not downright impossible, for fans to accept that they're not actually the best of friends when the cameras stop rolling.

This particular situation certainly applies to Nathan Fillion and Stana Katic, who stuck it out across eight whole seasons of the popular ABC crime procedural "Castle." In the series, Fillion plays Castle, a mystery writer who gains access to the NYPD and joins investigations for his work. Eventually, he teams with detective Kate Beckett (Katic). As "Castle" progressed, so did Castle and Beckett's relationship, with the pair going from partners in the field to partners in life.

While the two had terrific chemistry on screen during the original run of "Castle," we now know that Fillion and Katic were not at all friendly when they weren't working on the ABC hit. Things were reportedly so tense between them that it may have even contributed to both Katic's shocking departure from the show, which was announced by Deadline just one month before the show's cancellation in 2016 (via Variety).

There were cold shoulders on the set of Castle

Following the cancellation of "Castle" in 2016, Us Weekly published a grim picture of the real-life working relationship between Stana Katic and Nathan Fillion. Per the outlet's report, "[Katic and Fillion] completely despise each other. They will not speak when they are off set, and this has been going on for seasons now." The precise source of the tension between Fillion and Katic doesn't appear to be a matter of public record as of this writing. However, a separate source claimed at the time, "The friction was very evident. Nathan has been nasty to Stana for a long time. Stana was a pro, [she] just wanted to get in there and do her job."

But it eventually became severe enough that, on the set of "Castle," Katic could reportedly be heard crying in her dressing room in between takes, according to one of the Us Weekly sources. The same source also claimed the actors attended sessions with a couples' counselor in order to try and deal with their feelings towards one another.

In a 2018 Entertainment Weekly interview, Katic characterized the firing as a surprise and didn't claim to know the reasons behind the decision. She explained, "I'm actually still not clear on the thought process behind the way that it went down. It hurt, and it was a harsh ending." Deadline's report on Katic's exit notes the actress was apparently not approached by ABC to renew her contract. It's also been speculated that her salary quote for the show's ninth season was too high, so it might have been a simple matter of contract negotiations or a budgetary decision gone wrong.

Whatever the reason for the show's somewhat abrupt conclusion, we probably won't know the full details for some time, if ever. "Castle" fans will likely be wondering about this rumored feud between until those details come out.