Nope, but the Americans documented these events quite well and if they didn't. Why the fuck not? It was the president and he was murdered, there is no reason not document these events properly and thoroughly unless something bigger was happening back then and possibly still happening.
Some of this is easily explainable.
Both presidents shot in the head. No shit, That's a kill shot. If you're going to kill aim for the head.
But the rest just seems so highly unlikely. Especially for two very important people within the same field to die like this.