Ex-IMF chief Dominique Strauss-Kahn's semen found on shirt of hotel maid accusing him of sex assault

Dominique Strauss-Kahn's semen was found on the shirt of a hotel maid who says he tried to rape her, sources said Monday.

The 32-year-old chambermaid told cops the French politician attacked her, tore at her clothes and tried to force her to perform oral sex in his hotel room May 14.

DNA taken from Strauss-Kahn matched genetic material found on the woman's shirt, sources said.

Investigators are still waiting for the lab results of carpet samples and swabs taken from the hotel sink.

The maid reportedly spit in the sink after she told hotel security that she had been attacked.

Strauss-Kahn denies the charges and his lawyers have hinted they may argue any contact between the former head of the Inteational Monetary Fund and the maid was consensual.

Strauss-Kahn, 62, predicted his name will be cleared.

"I deny in the strongest possible terms the allegations which I now face," he said in a farewell e-mail to his IMF staff.

"I am confident that the truth will come out and I will be exonerated."

The e-mail - obtained by CNN - was forwarded to the entire staff of the Inteational Monetary Fund Sunday evening by acting head John Lipsky.

Strauss-Kahn said his decision to step down from the global economic policy group was made with "profound sadness" and frustration, but he was anxious to spare the institution.

"I cannot accept that the fund - and you dear colleagues - should in any way have to share my own personal nightmare. So I had to go," he wrote.

He resigned from the IMF last week while still in jail. He was placed under house arrest by a judge on Friday and is confined to a lower Manhattan apartment.

His lawyer, Benjamin Brafman, stopped by around 2:30 p.m. for an hourlong chat with his client, but refused to answer any questions.

Strauss-Kahn's heiress wife, Anne Sinclair, put down more than $1 million to bail her husband out and will have to pony up at least $200,000-a-month to cover the security costs his court-ordered home confinement.