The cops screwed up badly. i don't believe any of it beyond his dying. Kennedy's entourage says one thing and the cops say something else. Take your pick.
Yea, Sirhan said he was innocent so that's that.
I don't recall that Sirhan said he was innocent. He says he has no memory of the incident. I will point readers back to the CIA reading webpage that I posted where they include all MK-Ultra released documents.