A Montana man who had been living with a teenager who disappeared from her home in Arizona years earlier was sentenced to decades in a prison for possession of child sex abuse material.

A man in Montana was detained and questioned by police as authorities try to piece together the mysterious disappearance and sudden reappearance of Alicia Navarro.

An Arizona teenager who vanished without a trace nearly four years ago is safe after walking into a police station in Montana, authorities said Wednesday.