The Umbrella Man
The "Umbrella Man", identified by the United States House Select Committee on Assassinations in 1978 as Louie Steven Witt, is the name given to a figure who appears in the Zapruder film and many other films and photographs during the assassination of President John F. Kennedy.
The Umbrella Man is a mysterious and highly suspicious individual who was one of the closest bystanders when the President was shot.
Why was he mysterious?
Well, when John F. Kennedy's car was seen passing the man in many pieces of footage, the man is seen opening a black umbrella even though it wasn't raining.
It is believed by many that the man actually played a crucial part in the killing of JFK. Some say he opened the umbrella as a signal to the shooter that he had a clear shot, and that he could go ahead and open fire. As three shots were fired, it is believed that the umbrella man raised the umbrella to communicate that he wasn't dead and to keep shooting.
The second belief is that the umbrella itself was infact a weapon.
Robert Cutler argued that the umbrella fired a paralysing dart at President Kennedy so that he would not have the mobility needed for the bullet to miss him. Making him an easier target. The reason people believe this is plausable is the fact that Charles Senseney of the CIA admitted that the CIA did possess such a weapon as of 1963. However, this theory is highly unlikely due to the fact that the President was easily able to raise his hands to his face after the first bullet hit him.
If either of these theories are eventually proven to be true, this shows that whoever did infact kill JFK, did not act alone. Though Lee Harvey Oswald was pinned with the blame, there are many more posibilites. Suspects also include the Babushka Lady and members of the CIA themselves.