Lisa Edelstein has been cast in a multi-episode arc on the upcoming sixth season of Castle, TVGuide.com has confirmed.
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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.
Edelstein, who starred on House for seven seasons, has since guest-starred on such shows as The Good Wife, Elementary and Scandal.