Detectives may search Yellowstone for missing Idaho teen Tylee Ryan, sources say Investigators are considering searching Yellowstone National Park as they look for two missing Idaho kids, sources tell CBS News. Tylee Ryan and Joshua “JJ” Vallow were last seen in September. Their mother, Lori Vallow, was arrested in Hawaii and faces child abandonment and desertion charges. Jonathan Vigliotti reports from Kauai where she’s behind bars.