OXFORD, Maine — Authorities say a Bethel mom whose 8-year-old son died as a result of injuries suffered in a car crash while she was behind the wheel will not face charges.

Prosecutors say there is insufficient evidence of criminal activity in the case to charge 28-year-old Jessica Thurston.

Police say her son, Matthew, was injured on Aug. 12 when the car she was driving struck a utility pole in Oxford, continued several hundred feet, at times airborne, and split a tree before bursting into flames. Thurston said she fell asleep at the wheel.

Matthew Thurston spent more than two months at Barbara Bush Children’s Hospital in Portland before succumbing to his injuries Oct. 24.

Police told the Sun Journal the investigation was completed just recently.