NEW : The gunman killed attorney Stanislav Markelov , 34 , in front of an office in central Moscow , Russian media reported . Chechens protest killings of lawyer and journalist in Moscow . Attorney Chechen killed in front of an office in central Moscow . Journalist Stanislav Markelov shot when she tried to intervene . Anastasia Baburova had opposed release of army colonel jailed for killing Stanislav Markelov woman .
NEW : Chechens protest killings of lawyer and journalist in Moscow . Attorney Chechen killed in front of an office in central Moscow . Journalist Stanislav Markelov shot when she tried to intervene . Anastasia Baburova had opposed release of army colonel jailed for killing Stanislav Markelov woman .