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People participate in a march in memory of murdered Kremlin critic Boris Nemtsov in Vilnius 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. AFP PHOTO / PETRAS MALUKAS (Photo credit should read PETRAS MALUKAS/AFP/Getty Images)
People participate in a march in memory of murdered Kremlin critic Boris Nemtsov in Vilnius 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. AFP PHOTO / PETRAS MALUKAS (Photo credit should read PETRAS MALUKAS/AFP/Getty Images)

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    4 arrested in killing of Kremlin critic

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4 arrested in killing of Kremlin critic

Authorities in Russia have now arrested four people in connection with the murder of an outspoken critic of Vladimir Putin, Boris Nemtsov.

4 arrested in killing of Kremlin critic

Authorities in Russia have now arrested four people in connection with the murder of an outspoken critic of Vladimir Putin, Boris Nemtsov.