Story highlights A spokesperson for Conyers said the staffer voluntarily dropped the case

The House Ethics Committee has opened an investigation into Conyers

Washington (CNN) Another former staffer alleged that Michigan Democratic Rep. John Conyers sexually harassed her, according to court documents filed in the United States District Court for the District of Columbia in March 2017 and obtained by CNN.

The lawsuit, which the woman later dropped after an unsuccessful attempt to seal it, was first reported by BuzzFeed News

The woman said she has known Conyers since 2006, but alleges the incidents occurred in 2015 and 2016.

CNN is not naming the woman, and she has not responded to multiple requests for comment. There was no lawyer listed for the woman in the suit.

Asked whether Conyers denied the claims in the 2017 suit, a spokesperson for Conyers said: "The former staffer voluntarily decided to drop the case."

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