JASPER, Tenn. (AP) — A Tennessee teenager has been accused of killing his girlfriend's toddler son in 2016. In a statement, the Tennessee Bureau of Investigation says 2-year-old Zayne Harper was fatally injured in August 2016 while his mother's then-17-year-old boyfriend was watching him. A warrant charging the unidentified suspect with first-degree murder and aggravated child abuse was served on Monday.