A variation on the theory that the British were involved in Aung San's assassination was given new life in an influential, but sensationalist, documentary broadcast by the BBC on the 50th anniversary of the assassination in 1997. This documentary investigated the fact that several low-ranking British officers had sold firearms to a number of Burmese politicians, including U Saw. Shortly after U Saw's conviction, Captain David Vivian, a British Army officer, was sentenced to five years' imprisonment for supplying U Saw with weapons. Vivian was freed from prison when Karen soldiers captured Insein Prison in May 1949. According to General Kyaw Zaw he then lived with the Karen people in Kawkareik until 1950, when he traveled back to Thailand and then to England, where he lived until his death in 1980. Little information about his motives was revealed either during or after the trial.