A 76-year-old Russian woman and her daughter were killed and \"Free Pussy Riot\" was written on a wall in their apartment, police in Kazan said Thursday. The slogan appeared to have been written in the victims\' blood, RIA Novosti reported. Nikolai Polozov, a lawyer representing the three imprisoned feminist punk rockers, called the killings a \"heinous dirty provocation.\" \"I regret that those monsters used the Pussy Riot name for such purposes,\" he said. Investigators in the Republic of Tatarstan said the woman and her 38-year-old daughter were killed between Sunday and Tuesday -- both were stabbed several times. \"Free Pussy Riot\" was written in English on a wall over their bodies. The members of Pussy Riot were convicted this month of staging a demonstration against Vladimir Putin before he was re-elected president at the Russian Orthodox Cathedral of Christ Our Savior in Moscow. They were sentenced to two years each.