During the 1960s , he became more politically active and worked on Robert F. Kennedy 's Democratic presidential campaign . He was present on the night of June 4/5 , 1968 , at the Ambassador Hotel in Los Angeles at the time of Kennedy 's assassination . During the same year , he discovered he had been raised by his grandmother , not his mother , and that the woman he thought was his sister was actually his mother . These events deeply affected Darin and sent him into a long period of seclusion
Kennedy 's assassination
Assassination of Robert F. Kennedy
Bobby Darin