An unnamed teenager has filed a lawsuit against the Alpha Delta Phi fraternity and its University of Chicago chapter, alleging negligence in preventing sexual assaults at the fraternity house. The lawsuit claims the fraternity ignored known risks and failed to implement adequate safety measures, despite a history of similar incidents dating back to 2009.

The legal action comes just days after another sexual assault allegation was reported at a different fraternity near the University of Chicago campus. The plaintiff, identified as Jane Doe, alleges she was sexually assaulted on February 7th when she was unable to provide consent. Attorneys for Jane Doe stated that the fraternity and its national organization were aware of risks but did not take meaningful action.

According to the lawsuit, Jane Doe was found struggling to speak and walk after the alleged assault. The fraternity has stated it suspended the member involved upon learning of the allegations. ABC News has reached out to the University of Chicago for comment, and the accused fraternity member has not yet responded.

The lawsuit details a pattern of alleged incidents at the Alpha Delta Phi house, including two reports of sexual assault in 2009 occurring five days apart. A social media post in 2022 also alleged a sexual assault at the same location. The suit contends that between 2009 and February 2026, the national fraternity organization received further reports of misconduct involving the Chicago chapter or its events.

Despite these reports, the lawsuit claims Alpha National did not impose interim suspensions, restrict social events, or mandate secured residential floors and sober monitors during parties. The attorneys for Jane Doe assert that the fraternity made public commitments to sexual assault prevention but failed to enforce its own policies at chapter events.

Jane Doe was attending a party at the fraternity residence on the day of the alleged assault. The suit states that a fraternity member offered her an unidentified alcoholic drink, after which she became incapacitated.

The University of Chicago sign is displayed on the campus in Chicago. The fraternity's national organization, Alpha National, reportedly has a responsibility to educate its members on sexual violence prevention. The lawsuit argues that these responsibilities were not met, contributing to the alleged assault.

This case highlights ongoing concerns regarding sexual assault allegations at college fraternities and the effectiveness of prevention measures. The lawsuit seeks to hold the fraternity accountable for its alleged failures to protect students from harm.