Robert Kenneth Beausoleil is an American musician, actor and artist. He was given the death sentence for killing his friend Gary Hinman, a fellow associate of Charles Manson and members of his communal "Family", on July 27, 1969. Robert Kenneth Beausoleil is an American musician, actor and artist. He was given the death sentence for killing his friend Gary Hinman, a fellow associate of Charles Manson and members of his communal "Family", on July 27, 1969.