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Deadly legacy

The onetime spy suffered nausea and internal bleeding before death by polonium-210 poisoning. ()
BEGINNINGS: Marie and Pierre Curie discovered polonium a century ago. It first claimed a researcher in the Curie lab, and later killed their own daughter. (Associated Press)
IN GERMANY: Men check one another for radioactive contamination after seizing evidence at a site connected with Dmitry Kovtun, who had contact with Litvinenko. (Roland Magunia / AFP/Getty Images)