Fifty years ago on June 5th 1968 US Senator Robert F Kennedy was assassinated.
His brother President John F Kennedy had been shot dead five years before.
Robert F Kennedy's shooting occurred minutes after he gave his victory speech after winning the California Democratic primary and he died the next day.
Palestinian-born Sirhan Sirhan was convicted of the shooting and is serving a life sentence for it.
But last year Kennedy's son Robert F Kennedy Junior talked with Sirhan in prison and left having doubts over the conviction.
He's asked for it to be re-examined.
Sirhan did plead guilty, but he also said he has no recollection of the shooting.