Police here arrested a man and his sister for beating one of their sisters, 20, to death and burying her body in a deserted area two months ago. The crime was revealed when another brother living in Riyadh had a dispute with the assailant duo and discovered the details. He, then, reported the matter to the police. The woman, the main suspect and assailant, confessed during investigations and guided the police to the location where she and her brother and son had buried the body. Abdullah Thafran, Asir Police spokesman, said investigations are continuing into the circumstances of the case.