SEATTLE -- Seattle Seahawks tight end Jerramy Stevens, recently charged with drunken driving, has been sued by a young woman who alleges he sexually assaulted her three years ago.

Stevens was arrested and jailed overnight for investigation of sexual assault in the 2000 case but no criminal charges were filed.

Stevens' lawyer emphatically denied the allegations.

The young woman, now 22, contends Stevens raped her outside a fraternity party when they were both students at the University of Washington. In the King County Superior Court suit filed Wednesday, she contends Stevens forced himself on her after someone slipped a drug into her beer in June 2000, and that she awoke the next day with no memory of what happened.

The lawsuit alleges that physical evidence from the woman's hospital examination shows that she had sexual contact with Stevens.

King County prosecutors said a four-month police investigation did not produce enough evidence to pursue the case. According to the lawsuit, one witness at the party called 911 to report that two people were having sex in the bushes outside the fraternity house and that the woman appeared "out of it."

Another witness reported seeing Stevens running from the party at about the time police arrived, the lawsuit said.

Stevens' lawyer, Mike Hunsinger, said Thursday that Stevens passed a lie-detector test as part of the investigation.

"The victim doesn't know, or claims she doesn't know, what happened," Hunsinger said. "He did not rape her. She apparently thinks he did. He's right, and she's wrong."

Rebecca Roe, the woman's lawyer, declined to respond to Hunsinger's statements Thursday.

Seahawks officials had no comment.

The woman, identified in the lawsuit only by initials, also is suing the Sigma Chi fraternity, alleging she was served two beers there, despite her age. She said that after drinking one beer that was already open, she lost coordination, muscle control, and ultimately, any recollection of the evening. Several witnesses recalled seeing her dazed, stumbling and appearing ``out of it,'' according to the lawsuit.

Prosecutors said they found no evidence that a date-rape drug was used.

Seattle attorney Doug Luetjen, who has done legal work for the fraternity and is an alumnus, said Thursday: "We see it as a very unfortunate circumstance, but we're now in litigation involving what is basically a dispute between Jerramy Stevens and the woman. It's really a matter for the two of them."

The fraternity maintained at the time, and continues to maintain, that it did nothing wrong, he said.

Stevens, 23, was charged in Kirkland Municipal Court last month with drunken driving, six weeks after police found two half-empty champagne bottles on the floor of his vehicle during an April 3 traffic stop.

Before the Seahawks made him their first-round draft pick in 2002, the 28th overall selection, Stevens had promised to clean up his off-field troubles.

The five-year, $6.2 million contract Stevens signed last summer includes provisions where he could be forced to repay portions of a $2.3 million signing bonus if he is convicted of wrongdoing.

While at Washington, in addition to the sexual assault investigation, Stevens pleaded guilty to misdemeanor hit-and-run property damage after driving into a nursing home in 2000. As a student at River Ridge High in Olympia, Wash., he was arrested in 1998 for participating in a prearranged fight.