One year on, Nemtsov allies seek murder masterminds A small group of volunteers arranges flowers at the makeshift shrine on a bridge just metres from the Kremlin where Russian opposition leader Boris Nemtsov was gunned down a year ago. While supporters of the charismatic former deputy prime minister struggle to maintain the memorial, those close to Nemtsov are also fighting another battle -- to try to find out why he was murdered and who was behind his shocking killing. IMAGES AND SOUNDBITES.