The theory is that as the assassin opened fire, Hickey grabbed his own gun. But
when the whole motorcade shunted to a halt, the agent was jolted by the sudden
stop and accidentally pulled the trigger - firing a bullet straight at the back of
Kennedy's head.
Mr McLaren said he believes Agent Hickey's AR-15 was loaded with different from
the ammunition used by Lee Harvey Oswald, who the Warren Commission declared
in 1964 to be the lone gunman in the assassination. That, he claims, explains what
they believe are the different ballistic profiles of the two bullets that struck Kennedy.
Lee Harvey Oswald, who was arrested for the assassination but himself shot dead
before he could stand trial. Oswald was himself assassinated before he could stand
trial over the killing.
Mr Menninger insisted that they do not believe that Agent Hickey intentionally fired
at Kennedy. Rather, the Huffington Post reported him as saying, 'this was a tragic
accident in the heat of the moment.'
But the pair do allege that the government moved swiftly, with the help of
Kennedy's brother Robert, to cover up the Secret Service's involvement and save
the agency from embarrassment.
Agent Hickey, who died two years ago, said in his witness statement given the day
after Kennedy's assassination that after he heard the gunfire he did indeed rise to
his feet and load and cock the AR-15, but did not fire it.
He said: 'At the end of the last report I reached to the bottom of the car and picked
up the AR 15 rifle, cocked and loaded it, and turned to the rear.
'At this point the cars were passing under the over-pass and as a result we had left
the scene of the shooting. I kept the AR 15 rifle ready as we proceeded at a high
rate of speed to the hospital.'
Mr Menninger's book, which was published in 1992, claims that it was a shot from
Agent Hickey's gun that actually killed the president, citing evidence which
appeared to show that Kennedy was hit by two different kinds of bullet.
AR-15 rounds are encased in thin copper and tend to break up upon impact, as did
the shot that struck Kennedy in the head. A 6.5mm Mannlicher-Carcano bullet of
the kind known to have been fired by Oswald, on the other hand, would not break up when it hit the target.
Agent Hickey sued Mr Menninger in 1995 over the allegations contained in Moral
Error, but the case was dismissed after a judge ruled that he had taken too long
after the book's publication to file his case.Rufus W. Youngblood, the agent in
charge of the Secret Service detail protecting Vice President Lyndon Johnson on the
day, also denied suggestions that Agent Hickey fired his weapon.In an interview
with the Georgia Tech alumni magazine in 1992, just prior to Mortal Error's
publication, he labelled the theory 'ridiculous'.
'I don't think any Secret Service guy fired his weapon down there that day. I could
look ahead and see [George] Hickey, an agent in the president's follow-up car, who
had the AR-15 [rifle]. He stood up and looked, but didn't see anything to fire at,' he said.