A memorial service will be held Sunday in place of a planned opposition rally , Russian media reports . Opposition leader was shot while walking on bridge near Moscow , authorities say . But Baker also said there might not be a political connection to the killing . ` Boris Nemtsov criticized elections , Olympics , Ukraine , Kremlin 's Ukraine policy .
A memorial service will be held Sunday in place of a planned opposition rally , Russian media reports . Opposition leader was shot while walking on bridge near Moscow , authorities say . Boris Nemtsov criticized elections , Olympics , Ukraine , Kremlin 's Ukraine policy .