30th September 1978
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Georgi Markov was a Bulgarian novelist, playright and disident who defected to the West in 1969 and subsequently worked for the BBC. He was attacked at a bus-stop near Waterloo Bridge on the 7th September 1978 and died in hospital on the 11th of ricin poisoning. The killer, believed by British Security to have been working for the Bulgarian Security Forces, has never been identified.