The lawsuit, which alleges Hall committed "multiple instances of sexual assault and battery against (Hilliard's) person" in 2017 and 2018, was filed May 31 in Cleveland County District Court.
The lawsuit also alleges Hall committed intentional infliction of emotional distress against Hilliard. The lawsuit says Hall's "intentional, egregious and outrageous conduct against (Hilliard) caused prolonged and severe emotional distress that continues to the present."
Hilliard is seeking "relief in excess of $75,000" in actual, compensatory and punitive damages.
According to the report from The Oklahoman, Hilliard has also filed a notice of tort claim against the university, which would seek $350,000 over alleged "negligent supervision" of Hall and other negligence. A notice of tort claim often leads to a lawsuit, according to the report.
The lawsuit against Hall was filed two weeks before former OU President David Boren, who has also been accused of sexual harassment, resigned as president emeritus and separated from the university. The lawsuit does not involve Boren.
The lawsuit comes after months of investigation by the Jones Day law firm and the Oklahoma State Bureau of Investigation into allegations of sexual harassment against Boren and Hall.
This article was corrected at 7:08 p.m. June 18 to accurately describe the notice of tort claim that Hilliard has filed.