A 41-year-old woman used a belt to strangle her boyfriend yesterday in his Sheung Shui home before hanging herself in the kitchen. The deaths came to light when a friend of the 43-year-old victim called police for help after the man failed to answer his door on the 31st floor of Yiu King House, King Sing Court. Firemen were called to force open the door at about 8pm and the man was found on a sofa. There were marks on his neck, which police said were caused by a belt found in the living room. Officers then found the woman hanged in the kitchen. Police said she was the man's girlfriend, although they did not live together in the Home Ownership Scheme flat. The victim's friend suspected something was wrong when the man failed to turn up for work yesterday. He later noticed there were lights on in the flat when he called on him although he could get no response. He told police he last saw his friend the previous night, when they had dinner together. Detectives investigating the case believe the relationship between the couple had deteriorated lately. Last month a man hanged himself after killing his nine-year-old son and 10-year-old daughter and seriously injuring his other daughter, 12, in their Tsz Wan Shan flat. In response to this and similar tragedies, the Government announced it would expand services at family service centres to help families under stress. A suicide prevention centre is also to be launched to cope with the rising problem.