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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 4:00 p.m. When her companions turned around, Nyleen had vanished. An extensive search of the area turned up no indication of her whereabouts. An unknown man wearing a jogging suit was seen nearby just before she disappeared. It is not known if he was connected to Nyleen's case.
Nyleen's family was questioned about her disappearance and her stepfather was considered a person of interest in her case. Her mother has since died; it was reported she was murdered in Mexico in the 1990s.
Nyleen has never been located. The person who wrote and telephoned authorities has not been identified, and it is unclear whether this individual actually had anything to do with her disappearance. It's possible Nyleen simply wandered away from the group and succumbed to the wilderness, but her disappearance is classified as a non-family abduction. Her case is unsolved.
Jefferson County Sheriff's Office