Kevin Grossheim, 55, was responding to a morning distress call from a civilian vessel near Birch Cove Island in Voyageurs National Park. He brought the visitors, a family of three, onto his boat ...

Grossheim reached them with his boat, but it overturned after he picked them up, the National Park Service said. ''The front kind of nosedived, the boat listed, and flipped over upside-down ...