Tucked away in the northwest corner of Missouri is a small, dusty town 46 miles north of St. Joseph with a decades-old secret. This past weekend marked the 40th anniversary of the killing of Ken Rex McElroy of Skidmore. And despite there being dozens of witnesses, no one has ever been arrested or charged in connection with McElroy’s murder. In short: no one saw anything. Ken McElroy died in a hail of gunfire on the morning of July 10, 1981, while sitting in his truck outside a local tavern. He was known as the town bully, but they may be...