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Watch Castle Season 6 Episode 23 to see how Kate and Rick's wedding day didn't go as planned.

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Looking to watch Castle Season 6 Episode 23 online? TV Fanatic is your destination for every paid and free streaming option of the Castle S6E23 full episode from 2 affiliates.

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Episode Details

Castle Season 6 Episode 23: "For Better or Worse"

As Rick and Kate's wedding day draws near, a shocking event sends them on a wild run that threatens to ruin their day on the season finale of Castle.