Assassination attempts, threats, and conspiracies surrounding Dr. King.

The claim of another shooter

In 1993, Jowers told ABC's Sam Donaldson that Ray didn't kill King and that he knew who was paid to do it. That account provoked a new round of questions about King's murder. But Jowers didn't want to say more unless the district attorney granted him immunity from prosecution.

James Earl Ray, ailing and serving a 99-year prison sentence, once again pushed for a way to re-open the case. And thus began another investigation.

Local prosecutors in Memphis, including John Campbell, were assigned to look at claims by Jowers and others.

"You know there was a lot of people that all of a sudden, yes, just came out of the woodwork," Campbell said.

Investigators went back and interviewed people who were at Jowers' bar and grill in 1968. Campbell's investigation concluded that many of those people failed to back him up.

One witness who was supporting Jowers decades after the killing allegedly told her sister that she was motivated by the prospect of money, in a call that was overheard by investigators. And Jowers himself changed his tune, from what he told the FBI at the time of the murder.

"Within a couple of weeks, we figured out this first story wasn't going to go anywhere, it wasn't true," Campbell said.

Something else was happening around that time - the launching of another investigation, this time, by the Justice Department under President Bill Clinton.

Veteran civil rights prosecutor Barry Kowalski, who worked on the federal case against the police who beat Rodney King in 1991, led that effort.

"We conducted a conscientious and a thorough investigation and just like the four official investigations before it, found no credible evidence or reliable evidence that Dr. King was killed by conspirators who framed James Earl Ray," Kowalski told NPR.

Justice Department prosecutors interviewed 200 witnesses and reviewed tens of thousands of documents. They found Jowers and the theory of a government directed conspiracy were not credible. And they wrote that they discounted other allegations, claims the murder was somehow linked to the assassination of President John F. Kennedy.

Kowalski said that none of the subsequent theories or inquiries ever disproved the initial one: that Ray killed King, acting alone.

"I remain absolutely convinced that those well founded findings were correct," he said.

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