Game wardens in Maine say they're investigating the death of a 57-year-old hunter who died from an unintentional, self-inflicted gunshot wound.

The wardens say Mark Henderson, of Eustis, reported that he had unintentionally shot himself in the leg while bird hunting on Tuesday night. They say he was hunting near the northwest shore of Flagstaff Lake in Franklin County.

A game warden located Henderson, administered aid and loaded him into a truck. The warden service says emergency personnel continued to administer care to Henderson for about 40 minutes before he died from his injuries.

The warden service says the state averages about six hunting incidents per year, and this was the first incident this year. There have been three fatal incidents over the past 10 years.