Yes, Sirhan Sirhan, the man who conveniently "forgot" everything leading up to and including the shooting itself.
Strangely enough, years later his attorney's argued that he was framed. Even RFK's son, Robert F. Kennedy Jr., believes that Sirhan Sirhan was framed and did not actually conspire to kill RFK. He actually wants Sirhan Sirhan released [0].
[0] https://www.sfchronicle.com/opinion/openforum/article/Robert... [1] https://justiceforrfk.com/index.html