Just a little note: I'm seeking clarity regarding JFK's death because of the lack of clear evidence as to what exactly happened. (Or at least the lack of evidence that I've encountered) Which I'd guess is true for most people considering the lack of public consensus regarding JFK's death.
Lee Harvey Oswald. There is actually plenty of clear evidence that Oswald was the one responsible, and almost no credible evidence that anyone other than Oswald was responsible or involved. And while there might be a lack of public consensus as to JFK's death, there is an almost completely universal consensus on this point among actual academic historians. If you're interested in separating the pop-culture conspiracy bullshit from actual historical evidence, there are two books I can recommend that will leave you with pretty much zero doubt as to what the evidence suggests: Gerald Posner's Case Closed, and Vincent Bulgosi's Reclaiming History.
it was mark wahlberg