KARACHI (PPI) - A security guard killed his wife with an iron rod while she was sleeping, besides injuring her brother and son in Korangi police limits, said police and witnesses. Twnetly-two-years-old Najma, resident of house No.15 C Area, was sleeping in the house, where her husband killed her with an iron-rod and managed to flee. The accused also beat up the deceased's brother Ashiq 7, and her son from her first husband, Muhammad Rafique, 5. The police handed the body over to heirs after autopsy from Jinnah Postgraduate Medical Center and lodged an FIR No 814/08 under Section 302 of PPC against her husband. In another incident, a mentally retarded person broke into the house of an aged women and strangled her to death in police limits of Shah Latif here on Wednesday, said police and witnesses. Seventy-years-old Sughra, resident of R-167 Shah Latif Town Sector 17-A, was in her house when a mentally-retarded youth Abdul Hameed Jhakhrani broke into the house and tried to harass her. On her hue and cry he killed her. The body was handed over to the heirs after postmortem from JMPC, while the police have arrested the accused.