The National Center for Missing and Exploited Children sent out an alert for a missing teenager in Knox County. 16 year old Matthew Gray of Corbin was last seen on August 7. Gray is described as 6’1″ with brown hair and brown eyes. He weighs about 150 pounds. Anyone with information is asked to call NCMEC at 1-800-843-5678 or the Knox County Sheriff’s Office at 606-546-3181.