DULUTH — A man pleaded guilty Monday to fatally shooting his mother in the face as she slept in a recliner at their East Hillside home last summer. Nathan Douglas Davin, 47, told the court he was heavily intoxicated the evening of Aug. 16 when he fired a single, close-range shot that killed Mae Dean Davin, 74. “I am pleading on a Norgaard basis because I do not remember,” he stated in the plea petition. “I do not remember because I had drank to …