LUNENBURG, Mass. (AP) – One of two boys who suffered carbon monoxide poisoning in the woods in Lunenburg has died.

The boys were four-wheeling Friday night with three adults when one of the vehicles got stuck. The boys stayed in vehicle to keep warm and were later found unconscious by adults who were trying to free the jeep.

Nine-year-old Alejandro Thomasian of Fitchburg died Sunday, while 11-year-old Jobanny Matias of Leominster remains in critical condition at Massachusetts General Hospital.

The Office of the Chief Medical Examiner will perform an autopsy Monday. Lunenburg Police Chief Daniel Bourgeois says initial investigation shows the incident was “a truly tragic accident.”

Worcester District Attorney Joseph D. Early Jr. says local and State Police continue to investigate the case.

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