Russian police investigators stand near the body of Russian opposition leader Boris Nemtsov, covered by plastic, on Bolshoi Moskvoretsky bridge near St. Basil cathedral in central Moscow on February 28, 2015. Russian opposition leader Boris Nemtsov, a fierce critic of President Boris Yeltsin, was shot dead in central Moscow ahead of a major opposition rally this weekend, investigators and police said. AFP PHOTO / DMITRY SERERYAKOV (Photo credit should read DMITRY SEREBRYAKOV/AFP/Getty Images)
DMITRY SEREBRYAKOV/AFP/Getty Images
Russian police investigators stand near the body of Russian opposition leader Boris Nemtsov, covered by plastic, on Bolshoi Moskvoretsky bridge near St. Basil cathedral in central Moscow on February 28, 2015. Russian opposition leader Boris Nemtsov, a fierce critic of President Boris Yeltsin, was shot dead in central Moscow ahead of a major opposition rally this weekend, investigators and police said. AFP PHOTO / DMITRY SERERYAKOV (Photo credit should read DMITRY SEREBRYAKOV/AFP/Getty Images)
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Caption:Funeral assistants carry the coffin of Russian opposition leader Boris Nemtsov before a farewell ceremony in Moscow on March 3, 2015. Russia vowed on March 2 to find the killers of outspoken opposition leader Boris Nemtsov as fresh details emerged about the most shocking political assassination during Vladimir Putin's rule. Nemtsov's body will lie in state on March 3 at the Andrei Sakharov rights centre in Moscow, followed by his burial at the city's Troekurovskoye cemetery. AFP PHOTO / ALEXANDER UTKIN (Photo credit should read ALEXANDER UTKIN/AFP/Getty Images)
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