Léo Dufour, a 22-year-old Canadian student, was no novice when he set off to summit Allen Mountain alone last November. His death remains a mystery. By Ed Shanahan Good morning. It’s Friday. Today ...

Leo Dufour, 22, of Vaudreuil, Quebec, was reported missing Nov. 30 after he went hiking a day earlier on the Allen Mountain trail in the Adirondacks. His remains were found this past spring. A sign ...