According to TVLine, which first reported the casting, Edelstein will play Rachel McCord, a tough and talented federal investigator who could influence Beckett's decisions about her future. The end of Season 5 saw Beckett (Stana Katic) considering a move to Washington D.C. for a new job with the Attorney General's office, but the decision was made even more difficult when Castle (Nathan Fillion) asked her to marry him.
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