As Roman Polanski has returned to the film festival circuit, debuting his latest film, sexual assault allegations against him continue to mount.

On Tuesday, a fourth woman came forward to say that she was a victim of the acclaimed 84-year-old director. Former German actress Renate Langer filed a report with Swiss police claiming that Polanski raped her in February 1972, when she was just 15 years old, according to the The New York Times.

The day before, the Academy Award-winning director was at a press conference in Zurich, promoting his latest film, a psychological thriller about the relationship between two women and with the strangely apt title “Based on a True Story.”

The Polish-born director took a few moments away from talking up the film to tell reporters that it was “unfortunate” that his new work and his other acclaimed films — “Rosemary’s Baby,” “Chinatown” and “The Pianist” — are now viewed through the filter of the sexual assault scandals that surround him, the Hollywood Reporter said.

In offering a rare comment on this allegations, Polanski also argued the scandal should be behind him because he already pled guilty and served time for the late 1970s case that became the original source of all the controversy.

While staying at Jack Nicholson’s Los Angeles house in 1977 and doing a Vogue photo shoot with a 13-year-old girl, Polanski allegedly drugged her and had sex with her.

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Polanski, whose second wife Sharon Tate was murdered by Charles Manson’s cult in 1969, pled guilty to unlawful sexual intercourse, underwent psychiatric evaluation and spent 42 days in jail.

But when he heard that a judge was going to disregard a plea bargain and give him up to 50 years in prison, Polanski fled to Paris. He has remained a fugitive ever since, despite repeated attempts, including several pleas by the victim Samantha Geimer, to have the case dismissed.

More recently, Polanski spent nearly a year under house arrest in Switzerland before the courts there rejected a U.S. extradition request and set him free.

“As far as what I did: It’s over. I pleaded guilty,” Polanski told reporters in Zurich. “I went to jail. I came back to the United States to do it, people forget about that, or don’t even know. I then was locked up here [in Zurich] after this festival. So in the sum, I did about four or five times more than what was promised to me.”

But Polanski is naive if he expects the controversy to be behind him — especially with a new rape case being alleged. Swiss police confirmed to the Times that they have met with Langer, the latest alleged victim, and will determine whether she can pursue a criminal complaint.

Switzerland has eliminated its statute of limitations on child sex abuse cases. Langer told the Times that she had not previously reported her allegations to police — or confided in friends and family at the time of the alleged assault — out of concern that such news would upset her parents.

But before Langer’s allegations, other women have come forward to allege they, too, were Polanski’s victims. In 2010, British actress Charlotte Lewis accused Polanski of abusing her sexually when she was 16. More recently, a woman in Los Angeles, identified only as Robin M., said at a news conference that Polanski sexually assaulted her in 1973 when she was 16.

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Women’s groups have been making life difficult for Polanski, notably earlier this year when their protests forced him to withdraw as president of the Cesars, France’s equivalent to the Oscars.

He and Geimar case have also been the subject of two acclaimed documentaries, the Hollywood Reporter said.

At the Zurich press conference, Polanski apparently wasn’t asked about the other women’s allegations and only addressed the 1977 case involving Geimer. Polanski noted that she also wants the legal drama to be over.

“I’m sorry the judges who dealt with it the last 40 years were corrupted, one covering for the other,” he said. “So I don’t maybe one of them will [eventually] stop doing it.”

Overall, Polanski focused the press conference on a discussion about his new film, which stars Eva Green and his wife, French actress Emmanuelle Seigner. The Hollywood Reporter said “Based on a True Story” was well received by critics in Cannes.

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Polanski said he is particularly proud of it because it marks the first time that he, as a director, has focused on a story that explores the inner lives of two women and their conflict with each other.

He said, “Between men, conflict is more in the open, you know? With women it is hidden. They are more perfidious than the men, in general.”