Karachi: In a fit of rage, a man strangulated his wife to death after a heated argument at their residence on Wednesday, police said. Siddiqa Bibi, 25, wife of Ghulam Qadir, was killed in her house in Ayub Goth. Later, Qadir informed his wife’s relatives about her death. The family informed police, who took the body to the Abbasi Shaheed Hospital for a post-mortem. A medico-legal officer at the facility has conducted the postmortem, and a chemical examination is yet to be carried out.