An ambulance crewman was arrested last night after his wife was found strangled to death in their Belcher's Street flat in Western district. The body of Lau Siu-han, 43, a mother of two teenage children, was discovered yesterday. A post-mortem examination performed last night concluded that the woman had died from suffocation at about midnight on Monday. Bruise marks found on her neck are believed to have been caused by a towel. The woman's husband, 43, had told police he last saw his wife alive when he went jogging at 8am yesterday. He claimed that upon his return at 9.30am, he found her lying unconscious, face down on a bed, with her clothes dishevelled. He then called police. The couple's two children - a son in Form7 and a daughter in Form3 - were at school when he returned home. The woman was sent to Queen Mary Hospital where she was pronounced dead on arrival. Her husband told officers that she was a devout Buddhist who placed joss sticks outside the door of their flat every morning. The man suggested someone could have been hiding outside the flat and then attacked his wife when she opened the door. Police said they found no signs of forced entry or theft from the flat, although the man told officers a gold necklace, a gold ring and $6,000 in cash were missing. Detectives later viewed footage from closed-circuit television cameras inside the building. They arrested the woman's husband last night after the post-mortem results indicated a time of death which contradicted the husband's account of events. He has not been charged.