Georgi Markov

On September 7, 1978, Georgi Markov, a 49-year-old Bulgarian dissident writer working as a journalist and broadcaster for the BBC World Service and Radio Free Europe, was walking across Waterloo Bridge in London on his way to work. He felt a sharp sting in the back of his right thigh and turned to see a man picking up an umbrella. The man apologized in a foreign accent and quickly hailed a taxi. Markov thought little of it at the time.

That evening, Markov developed a high fever. He told his wife about the incident on the bridge, noting that a small red pimple had appeared at the site of the sting. His condition deteriorated rapidly over the next three days. On September 11, Georgi Markov died at St. James's Hospital. An autopsy revealed a tiny metal pellet—only 1.7 millimeters in diameter—embedded in his thigh. The pellet had been engineered with two tiny holes that had contained ricin, an extremely potent biological toxin derived from castor beans.

The investigation determined that the assassination was carried out by the Bulgarian secret service (Darzhavna Sigurnost) with technical assistance from the Soviet KGB, which had developed the modified umbrella weapon. The murder occurred on the birthday of Bulgarian Communist leader Todor Zhivkov, leading some to speculate it was intended as a 'gift.' Just ten days before Markov's murder, another Bulgarian defector, Vladimir Kostov, survived a similar attack in Paris when the pellet fired into his back failed to release its full payload of ricin.

Despite being one of the most notorious assassinations of the Cold War, no individual was ever formally charged. After the fall of communism, Bulgarian authorities investigated and identified a Danish-born Bulgarian agent named Francesco Gullino (codenamed 'Agent Piccadilly') as the likely assassin, but Gullino denied involvement and was never charged. The case was officially closed by Bulgarian prosecutors in 2013 due to the expiration of the statute of limitations.