Beckett gets a call on the Castle Season 6 finale. It's not news she wants to hear.
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Just when Kate Beckett thought she was getting the beautiful wedding she deserved, she was called to see Castle's car in flames on the side of the road in season 6 "For Better or Worse"
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After 4 seasons, Kate showed up at Castle's door to tell him exactly what she wanted. The kiss up against the door in "Always" left shipper hearts aflutter for the entire summer.
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Just when it seemed that their entire relationship was on the line, Rick Castle stepped up, got down on one knee and asked Kate Beckett to marry him in Castle season 5 finale "
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Talk about a "Knockout" punch. In the Castle season 3 finale, Kate Beckett is shot by a sniper at Capt. Montgomery's funeral. All Castle can do is hold her and tell her he loves her.
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In the Castle season 1 finale, "A Death in the Family" Kate Beckett is devastated when Castle does the one thing she asked him not to do, look into her mother's murder.
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A charming man from Beckett's past turns up just before her wedding on the season finale of Castle. "For Better or Worse" is the 23rd episode of the show's sixth season.
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Who is the dead man that Kate had under investigation and how was he killed? "Veritas" is scheduled to air Monday, May 5th.
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Castle Quotes

Castle: How do you know when you're in love?
Beckett: All the songs make sense.

Sometimes the hardest things in life are the things most worth doing.

Castle