In 1976, a respected U.S. diplomat named  William Bradford Bishop murdered his wife, mother, and three sons. He drove their bodies 275 miles to a swamp and set them on fire. Bishop vanished soon after, abandoning his car near the Great Smoky Mountains. He spent nearly 42 years on the FBI’s Most Wanted list and was never captured. No one knows if he died in those mountains…or if he simply became someone else.