Boris Nemtsov, critic of Putin, shot dead in Moscow

The body of Russian opposition leader Boris Nemtsov is covered with a plastic tarp on Moskvoretsky bridge near St. Basil Cathedral. (DMITRY SERERYAKOV / AFPGetty Images)

Feb. 28, 2015 8:53 AM PT

Opposition leader and former deputy prime minister Boris Nemtsov shot in central Moscow.

Russian opposition leader Boris Nemtsov slain

Investigators examine the body of Russian opposition leader Boris Nemtsov, who was shot to death Feb. 27. (GEORGE MALETS / EPA)

Opposition leaders Boris Nemtsov, left, Ilya Yashin, center, and Garry Kasparov lead a protest march in downtown Moscow in 2012. (Sergei L. Loiko / Los Angeles Times)

A 2012 photo shows opposition leader and former First Deputy Prime Minister Boris Nemtsov leaving a voting booth after marking his ballot as part of presidential elections in a polling station in Moscow. (ANDREY SMIRNOV / AFP/Getty Images)