BUNKER HILL, Ind. (AP) — A 76-year-old man has been stabbed to death while leading Boy Scouts on a hiking trip in northern Indiana, and a suspect who battered his mother and killed a dog at their home nearby is under arrest, police said. The assistant scout leader, Arthur L. Anderson, had stopped to identify a tree on the Nickel Plate Trail in Bunker Hill Sunday afternoon when an attacker approached him from behind and stabbed him in the neck, Indiana State Police said in a statement. Witnesses told police the attack was unprovoked.