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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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Boris Nemtsov: Defiant in the face of death

Imagine a world where death may silence you but could amplify the volume of your cause. Christiane Amanpour has more.

Boris Nemtsov: Defiant in the face of death

Imagine a world where death may silence you but could amplify the volume of your cause. Christiane Amanpour has more.