Robert Siegel talks with Diana Ivanova, a Bulgarian documentary filmmaker and former reporter for Radio Free Europe, about one of the Cold War's most notorious assassinations: The murder of Bulgarian writer and dissident Georgi Markov by poison-tipped umbrella. Bulgaria decided a statute of limitations was finally reached yesterday, 35 years after Markov died of ricin poisoning. British police, however, are continuing with their own investigation into Markov's assassin.
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