Eighty-two-year-old Bernard Perry has Alzheimer's and walked away from his home into a bitter cold night.
Maine state trooper Tyler Harrington found Perry in a ditch with the help of a snow plow driver.
Officials believe Perry was in the ditch for about 90 minutes before rescuers found him.
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Harrington went into ditch and carried Perry to safety.
Perry was taken to the hospital and treated for hypothermia and frostbite.
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