An autopsy finds that a waitress died of severe head injuries after getting her head caught in a dumbwaiter at a Wisconsin restaurant last week.

Fountain City Police Chief Jason Mork on Tuesday released the autopsy results for 21-year-old Brooke Baures, a senior and standout gymnast at Winona State University in Minnesota.

Baures was working at WingDam Saloon and Grill when the accident happened Dec. 1.

Based on witness' statements, police believe Baures was the only person who could have pressed the dumbwaiter's control button on the second floor. Police believe her head was almost entirely inside the cab of the elevator when it descended.

The autopsy found "extensive destruction" of the brainstem and left side of the cerebellum.

The dumbwaiter has since been permanently removed.