For years, conspiracy theorists who believe that the U.S. government plotted the murder of Martin Luther King Jr. have focused on Merrell McCullough, an undercover Memphis, Tennessee, policeman who was seen crouching beside King's body moments after the civil rights leader was shot at the Lorraine Motel 29 years ago last week. According to the theorists, McCullough was a secret U.S. agent who helped cover up the plot by pointing toward the flophouse from which the FBI maintains James Earl Ray fired the fatal shot, leading police away from a brushy area across the street where several witnesses saw a man...

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