Laura Benanti is to guest star on the mystery series "Elementary," CBS announced.

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The Broadway actress and singer is to play a woman from detective Sherlock Holmes' past, who resurfaces in the Oct. 17 episode of the show, which is now in its second season.

"When the CEO of a financial consulting company is poisoned to death, Holmes and Watson are called upon to track down the killer," a synopsis said.

"Meanwhile, a woman from Sherlock's past emerges as a possible suspect."

Jonny Lee Miller plays Holmes and Lucy Liu plays Joan Watson.