A sergeant who pleaded guilty to violating a Marine Corps order barring hazing was demoted in connection with the beating of a private at Fort Knox, Ky.

Sgt. Michael P. Whitaker, 25, of Great Falls, Mont., was demoted to corporal during a special court-martial at the Marine Corps Air Station in Beaufort on Wednesday. He also was reprimanded in a letter.Whitaker, who had been a tank-maintenance instructor, was one of nine Marines charged after the beating of Pvt. Maciej Lugowski.