Robert Kennedy assassin Sirhan Sirhan hospitalized after he was stabbed by fellow inmate The man imprisoned for assassinating Senator Robert F. Kennedy was hospitalized Saturday morning after he was stabbed by a fellow inmate. Sirhan Sirhan is serving life in prison for the 1968 assassination, which occurred after Kennedy declared victory in the California democratic presidential primary. Officials said he was attacked Friday at a correctional facility near San Diego, and that he is in stable condition.