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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.
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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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.

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.