A Louisiana State University student and her firefighter fianc, high school sweethearts, were killed when a woman allegedly struck them with her vehicle as they walked along the side of a road early Sunday morning.

The Baton Rouge Police Department identified the victims as 21-year-old Leah Fonte and 21-year-old Shane Hirstius, who were engaged.

Officers arrested Mia Dawson, 20, in relation to the incident on charges of operating while impaired, reckless operation of a vehicle, hit-and-run driving, vehicular homicide and vehicular negligent injury.