The Maine attorney general’s office has taken over the investigation into a collision that killed a special education teacher in Berwick last week. The Portland Press Herald reported that Attorney General William Stokes said his office was asked by York County District Attorney Kathryn Slattery to oversee the investigation because the surviving driver is related to her family. Stokes said he is not allowed to identify the 17-year-old male driver because he is a juvenile and has not been charged with any crimes. Amy Harris, 34, died April 10 after her car collided with a sport utility vehicle that crossed the center line on Route 4. Her children, ages 7 and 4, were with her. The 7-year-old is recovering from surgery for a broken vertebra and torn intestine; the 4-year-old suffered cuts.