(KSL News) -- Utah County detectives are re-opening a 25-year old missing person's case.
Mary Katherine Miller of Provo vanished in June 1979. Her car was recovered from Mount Timpanogos, but Miller has never been found.
Detectives say the original investigation into Miller's disappearance was incomplete and left unanswered questions.
The sheriff's office is now reviewing reports, evidence, and witness statements.