rty at Alpha Delta Phi's house and accepted a shot of unidentified alcohol from a fraternity brother that quickly made her feel  unsteady and lightheaded,  her lawsuit states. The man then led Doe to a secluded bedroom on another floor, where he allegedly made  unwanted and nonconsensual sexual advances  after she  lost all physical and verbal ability to refuse  him, according to the lawsuit.

 Jane Doe was mentally and physically incapable of providing consent,  the suit alleges.

Doe pleaded with the man to use a condom, but he refused, the complaint says. The fraternity brother then penetrated her  without her consent  and left her  alone and unconscious in the room,  according to the suit.

The suit says Doe's friend was initially blocked by other fraternity brothers from going upstairs to check on her, until a member who saw Doe unconscious told them to let the friend up. The friend found Doe unconscious and helped her out of the house, the complaint states.

The next morning, Doe found bloodstains in her underwear and reported the incident to the Chicago Police Department, naming the fraternity brother who allegedly sexually assaulted her, according to the lawsuit, prompting police to investigate.

Doe's suit claims the fraternity failed to abide by its own rules of conduct, which it lays out in detail, including duties to provide sober monitors at events and to protect against sexual assault by its members.