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LITTLEFIELD, Ariz. — The two Utah teenagers killed in a single-vehicle rollover on Interstate 15 in northern Arizona Saturday have been identified, and the passenger’s death came one week after the death of her mother.

The teenage driver, Carson Glen Koch, and his girlfriend, Brayden Eaton, both 17, were fatally injured in the crash that was reported on Interstate 15 northbound near mile marker 12, a few miles north of Littlefield, Arizona shortly after 2 p.m.

Carson Koch and Eaton were both juniors attending Hillcrest High School in Sandy, Utah, Carson Koch’s mother, Jody Koch told St. George News Monday.

She also said that Eaton’s mother died one week ago from liver failure, “and I don’t know what this is going to do to her (Eaton’s) grandmother or her little sister,” she said.

Eaton was returning with Carson Koch to Utah from Las Vegas after spending a family vacation in Southern California, and were traveling some distance behind his parents’ vehicle.

Eaton was the owner of the red passenger vehicle, but Koch was driving that particular leg of the trip.