The woman who was at the Duke University lacrosse house where a stripper claims she was raped now refutes a key part of the alleged victim's account of what happened that night in March.

Kim Roberts, who danced at the same party as the accuser where the alleged incident took place, told "60 Minutes" correspondent Ed Bradley in an interview that she didn't help the accuser get dressed after the alleged incident, nor was she physically separated from the accuser by the Duke lacrosse players at any time. The accuser said in her police statement that both occurred.

Roberts had previously called rape allegations a "crock" in another interview, and has said she was with the accuser most of the time and could not be sure any sort of assault took place. But during an April interview with The Associated Press, Roberts said she at first doubted the accuser's story, then changed her mind.

The "60 Minutes" interview is scheduled to air in its entirety on Sunday at 7 p.m. ET.

The accuser, a female student at nearby North Carolina Central University, claims she was raped in a bathroom of an off-campus Duke lacrosse house during a party by three players. But defense attorneys have presented ATM surveillance photos that show one of the three men she accuses somewhere else at the time of the alleged rape, and have pointed out numerous discrepancies in her story.

All but one lacrosse player has undergone DNA tests, which failed to point the finger at any of them. The only player who did not get tested was the lone black player on the team; the accuser said her attackers were all white.

During the "60 Minutes" interview, Bradley asked Roberts, who goes by the stage name "Nikki" when she performs, whether she was physically holding onto the accuser at the beginning of the alleged crime.

"In the police statement, [accuser] describes the rape in this way: 'Three guys grabbed Nikki,' 'That's you,'" Bradley said, "'Brett, Adam and Matt grabbed me. They separated us at the master bedroom door while we tried to hold on to each other. Bret, Adam and Matt took me into the bathroom.'"

He asked Roberts: "Were you holding on to each other? Were you pulled apart?"

"Nope," replied Roberts, who said that was the first time she had heard that version of what allegedly happened.

Roberts, who was sentenced to 120 days of house arrest on Sept. 25 for an unrelated probation violation, also denies the accuser's statement to the police that after the alleged rape, Roberts came into the bathroom and helped one of the rapists dress her.

"She obviously wasn't hurt ... because she was fine," Roberts said when asked by Bradley whether she saw signs of rape from the accuser.

"She tried to play it down the middle," a source close to "60 Minutes" told the Durham Herald-Sun.. "She tried not to offer an opinion as to whether it was a crock. She wants the viewers to decide. But she says she didn't witness any rape. She wants to set the record straight on some things [the alleged victim] has said. She doesn't know whether a rape occurred. She just knows some of the things [the accuser] alleged to have happened did not happen."

Bradley also interviewed the three lacrosse players indicted for the alleged rape: Collin Finnerty, Reade Selligmann and team co-captain David Evans. All three say they are innocent and say that none of their teammates took part in any assault.

Seligmann and Finnerty, both 20, and Evans, 23, are charged with rape, kidnapping and sexual offense. They have not yet been arraigned.

The "60 Minutes" source told the Herald-Sun that the defendants "tell us what they can, and they characterize the evening."

Evans graduated from Duke in May and was headed for a job on Wall Street. But now he's awaiting trial.

"Thirty years," Evans told Bradley in the interview. "I could go to jail for something that never happened."

In related news, defense attorneys said this week that District Attorney Mike Nifong's office hasn't handed over details of any statements from the accuser or handwritten notes from investigators.

Evans' attorneys said the information was not included in 615 pages of evidence Nifong turned over to them last month, according to a letter sent to the prosecutor on Wednesday, reported by The Associated Press. Nifong's assistant said the prosecutor was out of town and had not read the letter.