The rape charges against Dominique Strauss-Kahn will be officially dropped on Tuesday at a Manhattan court hearing scheduled for 11:30 a.m.

Prosecutors asked the judge on Monday to dismiss the charges because of doubts about the credibility of the hotel maid, Nafissatou Diallo, who accused Strauss-Kahn of sexual assault.

Diallo said that Strauss-Kahn, the former head of the International Monetary Fund, forced her to perform oral sex when she came to clean his room at the Sofitel hotel in Manhattan in May. The ensuing scandal forced Strauss-Kahn to resign from the I.M.F. and dashed his hopes of becoming the next president of France.

Forensic evidence showed that a sexual encounter took place in the hotel room, but prosecutors could not determine whether the encounter was consensual. Because the evidence was inconclusive and Diallo's credibility undermined, prosecutors decided not to pursue the case.

Diallo allegedly lied on her application for asylum, and that and other reported lies make it impossible to resolve the question of what exactly happened, prosecutors wrote, according to the Associated Press.

But while the criminal charges against Strauss-Kahn will almost certainly be dropped, he still faces a civil suit from Diallo. He may also face charges in a separate case in France, in which a writer, Tristane Banon, has accused him of sexually assaulting her when she interviewed him in 2003.

The collapse of the criminal case against Strauss-Kahn is a huge blow for the office of the Manhattan district attorney, Cyrus Vance, who has lost several high-profile cases recently. For example, in May, a court acquitted two police officers of charges that they had sexually assaulted a drunken woman after escorting her to her apartment. A conviction in the Strauss-Kahn case would have gone a long way toward restoring the district attorney's image.