A 60-year-old Janesville man is dead after trying to help his grandchildren on Lake Nichols Friday. The St. Louis County Sheriff’s Office says Douglas Yentsch was pulling a tube carrying the kids behind a paddle boat. When the tube overturned, the children, who were wearing life jackets, panicked and Yentsch went in the water to help them. He was later found by neighbors unresponsive after spending nearly 30 minutes under water. Efforts to revive him were unsuccessful. Yentsch was not wearing a life jacket.