Dominique Strauss-Kahn

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A French prosecutor on Monday opened a preliminary investigation into allegations of rape in a Washington hotel by Dominique Strauss-Kahn, a former International Monetary Fund chief and one-time French presidential hopeful. (Associated Press)

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Former International Monetary Fund leader Dominique Strauss-Kahn enters a building before his lecture at the Ukrainian Diplomatic Academy in Kiev on April 4, 2012. (AP Photo/Sergei Chuzavkov)

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Former International Monetary Fund chief Dominique Strauss-Kahn (partially visible at center) leaves a courthouse March 26, 2012, after being questioned in a probe into a suspected prostitution ring in Lille, France. (Associated Press)

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** FILE ** Former International Monetary Fund chief Dominique Strauss-Kahn arrives at a police station in Lille, France, on Tuesday, Feb. 21, 2012. (AP Photo/Michel Spingler)

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Dominique Strauss-Kahn, former head of the International Monetary Fund, leaves his home in Paris on Thursday, Sept. 29, 2011, on his way to a police station to confront a writer who has accused him of attempted rape. (AP Photo/Yoan Valat)

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Dominique Strauss-Kahn (right), former head of the International Monetary Fund, and his wife, Anne Sinclair, gesture to the media upon their arrival at their home in Paris on Sunday, Sept. 4, 2011. (AP Photo/Jacques Brinon)

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ASSOCIATED PRESS Former International Monetary Fund leader Dominique Strauss-Kahn (center) leaves Manhattan state Supreme Court with his wife, Anne Sinclair, and attorney Benjamin Brafman after a hearing Tuesday in New York. A New York judge dismissed the sexual assault case against Mr. Strauss-Kahn.

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Dominique Strauss-Kahn enters the Criminal Courts Building in New York on Aug. 23, 2011. (Associated Press)

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Nafissatou Diallo, the hotel housekeeper who has accused Dominique Strauss-Kahn, former head of the International Monetary Fund, of sexually assaulting her, leaves a state office building in New York with her lawyer, Kenneth Thompson, after meeting with prosecutors on Monday, Aug. 22, 2011. (AP Photo/Seth Wenig)

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Nafissatou Diallo, the hotel housekeeper who accused Dominique Strauss-Kahn of sexually assaulting her, listens as her lawyer Kenneth Thompson speaks to the media following a meeting at the Manhattan prosecutor's office on Aug. 22, 2011. (Associated Press)

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Dominique Strauss-Kahn, former managing director of the International Monetary Fund, waits for a taxi near his temporary residence in the Tribeca neighborhood of New York on Sunday, Aug. 21, 2011. (AP Photo/John Minchillo)

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ASSOCIATED PRESS Former International Monetary Fund boss Dominique Strauss-Kahn, widely seen as a potentially successful French presidential candidate before his May 14 arrest, was pulled off a plane and detained hours after Guinean immigrant Nafissatou Diallo reported she was attacked.

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Nafissatou Diallo, who accused former IMF Head Dominique Strauss-Kahn of sexually attacking her, speaks to reporters as her attorney Ken Thompson listens during a news conference Thursday, July 28, 2011, the Christian Cultural Center in the Brooklyn borough of New York. (AP Photo/Mary Altaffer)