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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)

A fierce supporter of Western values Boris Nemstov was the kind of liberal the Kremlin loved to hate. One of the most plausible theories for his death is to silence that voice, says political science Professor Daniel Treisman.