Russia's opposition supporters carry portraits of Kremlin critic Boris Nemtsov during a march in central Moscow on March 1, 2015. The 55-year-old former first deputy prime minister under Boris Yeltsin was shot in the back several times just before midnight on February 27 as he walked across a bridge a stone's throw from the Kremlin walls.
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Model may be key witness in slaying of Putin critic
CNN's Frederik Pleitgen reports that the companion of Boris Nemtsov, a Putin critic who was shot and killed, is still in Russia.
1:53 • Source: CNN
Boris Nemtsov Killed 15 videos
Russia's opposition supporters carry portraits of Kremlin critic Boris Nemtsov during a march in central Moscow on March 1, 2015. The 55-year-old former first deputy prime minister under Boris Yeltsin was shot in the back several times just before midnight on February 27 as he walked across a bridge a stone's throw from the Kremlin walls.
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Model may be key witness in slaying of Putin critic
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Report: Suspect in Nemtsov killing blew himself up
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Suspect in Nemtsov's death pleads guilty
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Boris Nemtsov speaks during an anti-Vladimir Putin protest in Moscow on September 15, 2012.
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Two arrested in Boris Nemtsov murder
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Will slain Putin critic's killer ever get caught?
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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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Russia opposition leader Boris Nemtsov laid to rest
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Russian authorities question Nemtsov companion
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Police question girlfriend of slain Putin critic
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Saakashvili: Nemtsov 'one of many' that have died
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Russia's opposition supporters carry portraits of Kremlin critic Boris Nemtsov during a march in central Moscow on March 1, 2015. The 55-year-old former first deputy prime minister under Boris Yeltsin was shot in the back several times just before midnight on February 27 as he walked across a bridge a stone's throw from the Kremlin walls.
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Boris Nemtsov: Defiant in the face of death
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FILE - In this file photo taken on Saturday, March 15, 2014, Boris Nemtsov, a former Russian deputy prime minister and opposition leader addresses demonstrators during a massive rally to oppose president Vladimir Putin's policies in Ukraine, in Moscow, Russia. Russian police say opposition leader Boris Nemtsov has been shot and killed in Moscow. (AP Photo/Alexander Zemlianichenko, File)
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Moscow TV: Video may show Putin critic's final moments
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Outspoken critic of Putin shot and killed
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Gary Kasparov remembers his friend Boris Nemtsov
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