Police say 15 year old Desiree Gray and a friend were walking on Route 198 by Mount Desert Campground when Gray was hit by a car.
Gray was taken to Mount Desert Island Hospital and died about 45 minutes later.
The other 15 year old girl told police she was grazed by the car. She was treated and released.
52 year old Rose Iuro Damon oF Mount Desert was driving the car. Police are reconstructing the accident and waiting for test results.
No charges have been filed.