Nyleen accompanied her family on a picnic outing in the in the Helena National Forest in the Elkhorn Mountains on June 25, 1983 near her hometown of Clancy, Montana. She was playing with some children who walked ahead of her for a moment at approximately 4:00pm. When her friends turned around, Nyleen had vanished. She was last seen sitting alone near the beaver dams on Maupin Creek. An extensive search of the area turned up no indication of her whereabouts. Nyleen has a small mole above her left eyebrow and dimples on both cheeks. Her upper left baby tooth was chipped at the time she vanished.