Walker County Coroner J.C. Poe said Kristin Avery, 17, was ejected from her vehicle after it left the roadway and overturned. Investigators believe she died on impact, Poe said.
Poe said investigators on the scene were unable to determine what caused the wreck.
Motorists passing by saw the wreckage and reported the incident to the Walker County Sheriff's Office. Representatives with the Parrish Fire Department and Alabama State Troopers also responded to the call.
The wreck occurred on Pleasant Field Road in Parrish. Poe said investigators believe the incident happened several hours before responders received the emergency call.