In the five decades since Martin Luther King Jr. was shot dead by an assassin at age 39, his children have worked tirelessly to preserve his legacy. They are unanimous on one key point: James Earl Ray did not kill Martin Luther King. For the King family and others in the civil rights movement, the FBIs obsession with King in the years leading up to his slaying in Memphis on April 4, 1968 - pervasive surveillance, a malicious disinformation campaign and open denunciations by FBI director J. Edgar Hoover - laid the groundwork for their belief that he was the target of a plot. Until her own death in 2006, Coretta Scott King, who endured the FBIs campaign to discredit her husband, was open in her belief that a conspiracy led to the assassination. Her family filed a civil suit in 1999 ... and a Memphis jury ruled that the local, state and federal governments were liable for Kings death. There is abundant evidence, Coretta King said after the verdict, of a major, high-level conspiracy in the assassination of my husband. The jury found the mafia and various government agencies were deeply involved in the assassination. Mr. Ray was set up to take the blame. But nothing changed afterward. William Pepper, a New York lawyer and civil rights activist who knew and worked with King ... became convinced of Rays innocence and continued to investigate the case even after Ray died. Pepper wrote three books outlining the conspiracy, most recently The Plot to Kill King in 2016, which were largely ignored by the media.