The Governor of California has said that he has denied parole to Sirhan Sirhan, the Palestinian refugee serving a life sentence for assassinating US presidential candidate Robert F. Kennedy in 1968.
Governor Gavin Newsom outlined his decision in an opinion piece in the Los Angeles Times.
Sirhan Sirhan, now 77, has been behind bars for five decades - despite doubts that he fired the shots that likely changed the course of US politics.
Mr Kennedy, the younger brother of president John F. Kennedy, was campaigning for the Democratic nomination when he was shot dead in a Los Angeles hotel.
His murder came just months after the killing of Black civil rights leader Martin Luther King Jr, and as a divided America was deep in an unpopular war in Vietnam.
Sirhan was convicted and sentenced to death in 1969 after pleading guilty.
His death sentence was commuted to life imprisonment several years later.
But doubts soon surfaced that he was actually responsible for Bobby Kennedy's death, with claims that there could have been a second gunman in the Ambassador Hotel on 5 June 1968.
His murder came just months after the killing of black civil rights leader Martin Luther King Jr, and as a divided America was deep in an unpopular war in Vietnam.
Mr Kennedy had given a speech at the hotel after winning California's Democratic presidential primary.
On a walkabout in the kitchen where he met staff, he was shot, as were several other people in his entourage, among them Paul Schrade, who took a bullet to the head.