Authorities say 33 year-old Jason Tracy and his 10 year-old son were killed when the snowmobile they were driving struck a tree on the edge of a field in Hermon.
It happened around 1:00 AM Sunday morning. Tracy's son was wearing a helmet at the time of the crash, but Tracy was not.
Maine Game Wardens, State Police Troopers, and Penobscot County Deputies were on scene investigating.
Lt. Dan Scott of the Warden Service cited speed and alcohol as contributing factors to the crash, and indicated wardens continue to investigate the incident.
Scott added, "EMS units from Hermon Fire and Rescue, Levant Fire and Rescue, and Capital Ambulance all assisted and were very helpful with the incident."
The Maine Warden Service reminds riders to slow down, never drink and ride, and be conscious of hazards and other riders on the trails.