HARRIS COUNTY, Texas (KTRK) -- A woman is dead after being hit by a car she fell out of, and her boyfriend, who was driving, is facing charges, the Harris County Sheriff's Office said.

Deputies said the couple was heading west on Salt Grass Trail Way at about 2 a.m. when the woman somehow exited the vehicle.

Investigators said they are not sure how the woman ended up outside the vehicle and alleged that she may have jumped out.