NEW : The youth 's father was a soldier in Seattle state . Jim Uttke , deputy medical investigator for the Spokane Medical Examiner , said it appeared the youth died of natural causes . The teen and his family were flying to Seattle for Saturday , fire department says . The plane made an emergency landing in Seattle . The flight had left Washington en route to Atlanta .
NEW : The youth 's father was a soldier in Seattle state . The teen and his family were flying to Seattle for Saturday , fire department says . The plane made an emergency landing in Seattle . The flight had left Washington en route to Atlanta .