Many suspecting a conspiracy in the assassination point out the two separate ballistic tests conducted on the Remington Gamemaster had neither conclusively proved Ray had been the killer nor that it had even been the murder weapon. Moreover, witnesses surrounding King at the moment of his death say the shot came from another location, from behind thick shrubbery near the rooming house, not from the rooming house itself, shrubbery which had been suddenly and inexplicably cut away in the days following the assassination. Also, Ray's petty criminal history had been one of colossal and repeated ineptitude, he'd been quickly and easily apprehended each time he committed an offense, behavior in sharp contrast to that of his shortly before and after the shooting; he'd easily managed to secure several different pieces of legitimate identification, using the names and personal data of living men who all coincidentally looked like and were of about the same age and physical build as Ray, he spent large sums of cash and traveled overseas without being apprehended at any border crossing, even though he had been a wanted fugitive. According to Ray, all of this had been accomplished with the aid of the still unidentified "Raoul." Investigative reporter Louis Lomax had also discovered the Missouri Department of Corrections, shortly after Ray's April 1967 prison escape, had sent the incorrect set of fingerprints to the FBI and had failed to notice or correct this error. Lomax had been publishing a series of investigative stories on the King assassination for the North American Newspaper Alliance, stories challenging the official view of the case, and had been reportedly pressured by the FBI to halt his investigation.

According to a former Pemiscot County, Missouri deputy sheriff, Jim Green, who claimed to have been part of an FBI-led conspiracy to kill King, Ray had been targeted as the patsy for the King assassination shortly before his April 1967 prison escape and had been tracked by the Bureau during his year as a fugitive. After several trips to and from Canada and Mexico during this time, Ray had gone to Memphis after agreeing to participate (allegedly controlled by his mysterious benefactor "Raoul" who reportedly had weeks before while in Birmingham, Alabama ordered Ray to purchase the Remington Gamemaster rifle) in what he was told was a major bank robbery while King was in town--since city police resources would be dedicated toward maintaining security for King and his entourage, the intended bank heist would be much simpler than usual. Green (who, like Ray, had asserted that FBI assistant director Cartha DeLoach headed the assassination plot) had claimed Ray had been ordered to stay in the rooming house and as a diversion for the purported bank heist, to then hold up a small diner near the rooming house at approximately 6:00 p.m. on April 4. King was shot a minute later by a sniper hidden in the shrubbery near the rooming house. Meanwhile, according to Green, two men, one of them allegedly a Memphis police detective, were waiting to ambush and kill Ray, while Ray was on his way to the planned diner holdup and then plant the Remington rifle in the trunk of Ray's pale yellow (not white) 1966 Ford Mustang, effectively framing a dead man. However, moments before the assassination, Ray had apparently suspected a setup and instead quickly left town in his Mustang, heading for Atlanta, Georgia. Atlanta police found Ray's abandoned Mustang six days after King had been shot.

On June 10, 1977, shortly after Ray had testified to the House Select Committee on Assassinations that he did not shoot King, he and six other convicts escaped from Brushy Mountain State Penitentiary in Petros, Tennessee. They were recaptured on June 13 and returned to prison. More years were then added to his sentence for attempting to escape from the penitentiary.

Recent developments

In 1997, Martin Luther King's son Dexter King met with Ray, and publicly supported Ray's efforts to obtain a trial.

In 1999, Coretta Scott King, King's widow (and a civil rights leader herself), along with the rest of King's family, won a wrongful death civil trial against Loyd Jowers and "other unknown co-conspirators". Jowers claimed to have received $100,000 to arrange King's assassination. The jury of six whites and six blacks found Jowers guilty and that "governmental agencies were parties" to the assassination plot. William Pepper represented the King family in the trial. 

In 2000, the Department of Justice completed the investigation about Jowers' claims, but did not find evidence to support the allegations about conspiracy. The investigation report recommends no further investigation unless some new reliable facts are presented.