If you believe Sirhan Sirhan killed Robert Kennedy... here's a fun question: Was his father Bishara Sirhan a JW?
In this newspaper article, they claim he is:
In this newspaper it says it has an inscription on the wall mentioning Jehovah:
They say he was smoking a chain of cigarettes, but that means nothing as smoking was not banned among the witnesses at that time.
In this July 9, 1968 Branch letter, Watchtower demands the story be squashed:
http://www.watchtowerdocuments.com/documents/1968_Watchtower_letter_on_Kennedy.pdf
They also say that: "subscribers to magazines published by Jehovah's Witnesses have canceled subscriptions."
Notice what the Watchtower is concerned about only 3 days after the assasination... as the Nation is still in mourning.