The Robert Kennedy one is also weird as hell.
The doco I saw a while ago (on mainstream TV in Australia, not a web doco) said Sirhan Sirhan claims to have no memory of it, and to actually be a supporter of the Kennedys, the gun he used vanished from police evidence before they could do forensics on it, and the doctor who looked at Sirhan Sirhan said he'd never seen anyone so easy to hypnotize in all his life. Plus, the doco mentions that the coroner's report says death by point-blank gunshot wound to back of the skull, while all witnesses say Sirhan was three foot in front of him waving the gun around.
I don't know who or what, but it's all too weird especially for another political brother to be killed in a weird way, which also has inconsistent information about the gun used in the shooting.
Personally, I pin the most likely suspect, if there was a conspiracy, as being Cord Meyer (a CIA guy) for a few reasons. First, Cord Meyer was one of the people shitbagged over Bay of Pigs and hated JFK for that. Second, JFK was banging his ex-wife, and he also hated JFK for that reason. Third, that ex-wife was outspoken about the JFK killing, and was killed herself by an unknown gunman about 1 year after JFK died. Fourth, E Howard Hunt (the convicted Watergate criminal) pinned it on him, according to two of Hunt's sons. Fifth, Nixon is on tape saying he didn't want Hunt around because "he knows too much about the whole Bay of Pigs thing". Which, if Nixon actually knew about it, would make sense and they might be using "the whole Bay of Pigs thing" as an allusion to the Kennedy assassinations, if that was in fact coordinated by CIA agents pissed about taking the blame as scapegoats for the Bay of Pigs failure. And finally, the context for Nixon being mortally scared of having hunt around because he "knows too much" about The Bay of Pigs "thing" seems hard to explain. What "thing" did he know? ... and how would it implicate Nixon? If Hunt's sons are telling the truth and their father really did a deathbed confession about JFK then that would be a sensible explanation.