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John F. Kennedy
What happened: John F. Kennedy was assassinated in November of 1963.
Lee Harvey Oswald assassinated JFK from the sixth floor of the Texas School Book Depository in Dallas, Texas.
Theory: The shot that killed John F. Kennedy actually came from a hill nearby.
The "grassy knoll theory" suggests the shot that killed JFK actually came from a hill nearby, not the book depository. According to eyewitness accounts, Oswald was spotted near the sixth floor of the Texas School Book Depository, but then who was the shooter from the grassy knoll? Some think the CIA was behind the assassination because they thought JFK would eventually disband them.