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April 09, 2013 at 08:23 PM EDT

Elementary fans are going to meet the most important woman in Sherlock Holmes’s life.

CBS has announced that Natalie Dormer is set to appear in a three-episode arc, playing Sherlock’s former lover Irene Adler, whose death at the hands of Moriarty has previously been mentioned on the show.

“We’re moving to the next chapter in our show — and in some ways, to a previous chapter in Holmes’ story,” executive producer and creator Rob Doherty said in a statement. “Irene Adler is perhaps the most pivotal relationship in Sherlock’s life, and I can’t think of an actress better suited to the challenge than Natalie.”

Dormer currently stars as Margaery Tyrell Game of Thrones and has also appeared on The Tudors, where she played Anne Boleyn.

Elementary‘s two-hour season finale airs May 9.

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