Who killed Kennedy? In a word, "Minutemen" with official ties, right-wing extremists from the Birch Society (often linked to Nelson Bunker Hunt), and Aryan Nations/Liberty Lobby/YAF (a front for Nazis emigrating from Munich) fascists, with Nixon, Pentagon and CIA ties. The motive was to pave the way for Nixon.
"To think - it was Nazis, all along." - Jack Ruby
The "LBJ killed JFK" psyop began with James Evetts Haley - a Bircher and a gifted libelist - the first to connect Johnson to organized crime in Texas and the Kennedy assassination, with particular reference to Billie Sol Estes - whose attorney was Douglas Caddy, an official of YAF . Subsequent writers have expanded on Haley's smears, most recently and notably Barr McClellan (former Bush spokesman Scott McClellan's papa). Note that Haley had a history of libel. From Wikipedia:
In 1929, Haley published The XIT Ranch of Texas and the Early Days of the Llano Estacado. Accused of libel in a dozen lawsuits, Haley was compelled in 1931 to withdraw the book from circulation and to pay the plaintiffs $17,500 to settle all pending claims. ...
A sharp critic of U.S. President Lyndon B. Johnson, Haley, who was a member of the John Birch Society penned, A Texan Looks at Lyndon: A Study in Illegitimate Power. The bestseller exposes Johnson's relationship with swindler Billie Sol Estes of Pecos. Haley pointed out that the three men who could have provided evidence in court against Estes -- George Krutilek, Harold Orr, and Howard Pratt -- all died mysteriously of carbon monoxide poisoning from car engines. Haley's admirers claimed in 1964 that the book was outsold in Texas only by the Holy Bible. Haley's fellow conservative, Phyllis Schlafly, then of Alton, Illinois, and now of St. Louis, self-published the best-selling A Choice, Not an Echo to bolster the Goldwater campaign, with emphasis on what she saw as the destructive legacy of the Republican "Eastern Establishment" formerly headed by New York Governors Thomas E. Dewey and Nelson A. Rockefeller. In 1936, in a meeting at the Adolphus Hotel in Dallas, Haley organized a short-lived third party, the "Jeffersonian Democrats of Texas", to offer opposition to President Franklin D. Roosevelt and the New Deal within Texas. In 1964, Haley returned to his previous Republican affiliation to endorse then U.S. Senator Barry M. Goldwater of Arizona, who was challenging President Johnson but fared poorly in Texas. Haley also claimed that Johnson had a motive for the assassination of President John F. Kennedy: "Johnson wanted power and with all his knowledge of political strategy and his proven control of Congress, he could see wider horizons of power as Vice-President than as Senate Majority Leader. In effect, by presiding over the Senate, he could now conceive himself as virtually filling both high and important positions - and he was not far from wrong. Finally, as Victor Lasky pointed out, Johnson had nursed a lifetime dream to be President. As Majority leader he never could have made it. But as Vice-President fate could always intervene." Houston Harte, a newspaper publisher in San Angelo who supported LBJ, said that his friend Haley had gone to the extreme in writing A Texan Looks at Lyndon. "Haley can no longer be considered a serious historian," Harte claimed.
In 1929, Haley published The XIT Ranch of Texas and the Early Days of the Llano Estacado. Accused of libel in a dozen lawsuits, Haley was compelled in 1931 to withdraw the book from circulation and to pay the plaintiffs $17,500 to settle all pending claims. He defended his work in which he had exposed "outlaws" and even made a trip into Mexico to authenticate a particular point in question ... http://en.wikipedia.org/wiki/J._Evetts_Haley
.... President John Kennedy responded to Birch Society criticism of his administration in an address delivered at a fund-raising dinner hosted by the Democratic Party at the Hollywood Paladium on November 18, 1961. "In recent months, I have spoken many times about how difficult and dangerous a period it is through which we move. I would like to take this opportunity to say a word about the American spirit in this time of trial. In the most critical periods of our nation's history, there have been those on the fringes of our society who have sought to escape their own responsibility by finding a simple solution, an appealing slogan or a convenient scapegoat." Political extremists, Kennedy said, sought the easy explanation for every national crisis and ignored political complexities. A downturn in the economy "could be explained by the presence of too many immigrants." Wars were orchestrated by "international bankers." China ended trade relations with the world not as a result of internal conflicts, but due to "treason in high places." With their rhetoric, "these fanatics have achieved a temporary success among those who lack the will or the vision to face unpleasant facts or unresolved problems." ...