On April 4, 1968, Dr. Martin Luther King, Jr. was shot while standing on the balcony of the Lorraine Motel in Memphis, Tennessee. An hour later, he was declared dead. For some 50 years, the federal government has maintained that James Earl Ray was the gunman who assassinated King that day. But within Martin Luther King’s family, there remains a persistent belief that Ray is innocent, and was set up to take the fall.But within a few days of confessing, Ray began to claim his innocence, arguing that that he had been set up by a man he knew only...