10.The driver did it.
In his book, 'Behold a Pale Horse' (1991), William Cooper claims that Kennedy was actually shot by his limousine driver. Cooper's theory appears to be almost entirely predicated on the fact the driver, secret service agent William Greer, is shown turning to his right and looking backwards.
There is, of course, no evidence at all that Greer was the shooter - though he was criticised by many after the assassination for his actions that day in not immediately accelerating away from the scene.
9. Kennedy was accidentally shot by a secret service agent
In his 1992 book 'Mortal Error: The Shot That Killed JFK', Bonar Menninger, suggests that Kennedy was actually killed by a fatal shot fired accidentally by Secret Service agent George Hickey, who was riding in the follow-up car. The theory suggests that Hickey accidentally fired an AR-15 assault rifle when the vehicle stopped suddenly.
8. The Umbrella Man
The Umbrella man, identified as Louie Steven Witt, serves as an example to conspiracy theorists about the often benign reasons weird things happen at significant historical events. Witt was captured on the Zapruder film and several other pieces of footage standing by the Stemmons Freeway sign within Dealey Plaza.
What is unusual about Witt is that he was holding a large black umbrella on a completely dry day. Some suggested this was a signal to shooters, but it was later revealed he was holding the umbrella as a protest against Kennedy's father's support for Nazi-appeasing British Prime Minister Neville Chamberlain - who was often seen with a trademark black umbrella.
Some even suggested the Umbrella Man was the actually assassin and had used the modified Umbrella to fire at Kennedy.
7. The Freemasons did it
Lyndon B. Johnson was allegedly a member of the Freemasons as was Warren Commission appointee, Gerald Ford (pictured). This has led to the suggestion that the secretive organisation was involved in the killing. There is, of course, no evidence of this at all.
6. Lyndon Johnson did it
Who had the most to gain from the assassination of Kennedy? According to two books by Scottsdale attorney, Craig Zirbel, only Johnson, had the motive, the means and the opportunity to mount a conspiracy against the president.
The book suggests that Johnson's political and personal issues with Kennedy, along with a desire to be president before he got too old, prompted his involvement in the killing of the President.
5. Joe DiMaggio did it
An idea that first floated in DC Comics' 100 bullets, is the theory that baseball player Joe DiMaggio was behind the killing. The theory has gained traction with conspiracy theorists who suggest that the talented sportsman wanted to kill Kennedy in revenge for his allegedly ordering the death of his former wife Marilyn Monroe. There appears to be little or no evidence to support this theory.
4. JFK Was Killed by the Federal Reserve Banks
In his book Crossfire Jim Marrs points the finger at Federal Reserve. According to Marrs the motive was to stop Executive Order 11110, which was a measure designed to curtail the power of the Reserve by replacing Federal Reserve Notes with Silver Certificates. It's often suggested that Lyndon B. Johnson revoked the order when he came to power. This isn't, however, true. It remained on the books until President Ronald Reagan issued Executive Order 12608 on September 9, 1987.
3. The Coca-Cola Theory
In 'Who Shot JFK? : A Guide to the Major Conspiracy Theories (1993)' by Bob Callahan and Mark Zingarelli, it is suggested that Oswald killed JFK because of a psychological problem caused by his addiction to refined sugar. The theory appears to be largely based on the fact that Oswald drank a sugary beverage immediately after the shooting.
2. Jackie Kennedy did it
Conspiracy theorists often point to the Zapruder film, in particular frames 312-317 which show a puff of smoke next to the left side of the President's head. Theorists argue that as neither John nor Jackie Kennedy are smoking a cigarette the smoke must have been caused by some explosive reaction.
The suggestion is that Jackie was part of a conspiracy that involved Texas Governor John Connally. There is, again, no real evidence for this except a sketchy interpretation of the Zapruder film.
1. JFK was killed because of his interest in aliens
In his book 'A Celebration of Freedom: JFK and the New Frontier' author William Lester says that CIA documents released to him under the freedom of information act reveal Kennedy demanded to be shown confidential documents about UFOs just 10 days before his assassination.
Alien researchers have suggested that the documents add weight to the claim Kennedy was killed to stop him discovering the truth about UFOs.