The results of an autopsy by the Chief Medical Examiner’s Office in Burlington has determined that a 17-year-old Middlebury teen who went missing for nearly a week in April died of hypothermia from exposure to the cold.

Rebecca Ball’s body was found by a police canine in Weybridge on April 3, six days after she was last seen near Wright Park in Middlebury without a coat, a hat, gloves or socks.

Ball’s disappearance triggered a massive search by state and local law enforcement, a crew of volunteers and a National Guard helicopter. Police said Ball was autistic and suffered from psychological disorders.