By the time he was 18, Pedro Rodrigues Filho had already committed 10 murders in his native Brazil. He was just getting started, though — he would kill at least 61 more before he was arrested in 1973. But Filho lived by a code: He only went after criminals and those who had wronged him. That included his own father — when Filho found out his father had killed his mother, he cut out his heart and ate it.