ATLANTA, Ga. (Atlanta News First) – A DeKalb County School District teacher has been arrested after police believe he sexually abused a 14-year-old. Marcus Knight, 49, of Lawrenceville, was arrested by the Gwinnett County Police Department and booked in jail last Tuesday. He faces six charges related to child molestation, alongside charges of enticing a child for indecent purposes and obscene internet contact with a child, jail records show.