article_snippet: Nemtsov, one of President Vladimir Putin's most outspoken critics, was shot in the back on a Moscow bridge as Zaur Dadayev walked with Zaur Dadayev girlfriend near the Kremlin in February 27.
article_snippet: President Vladimir Putin has condemned Nemtsov's killing and ordered three law enforcement agencies to investigate, the Kremlin has said.
article_snippet: President Vladimir Putin also wrote to Nemtsov's mother, saying President Vladimir Putin shared Nemtsov's mother grief, and promised to bring those behind Nemtsov's killing to justice.