SYDNEY police investigating the murder of a Hong Kong woman whose badly decomposed body was found in rugged countryside have centred their investigation on the local Chinese community. The body of Kitty Lee Ling-ling, 42, was cremated in an emotional service in Sydney attended by her 27-year-old sister Ann Lee Fun-fun, who flew to Australia this month. Homicide detectives formally identified the body last week using dental records flown from Hong Kong. Lee vanished from a technical college in the southern Sydney suburb of Regents Park on August 11 after attending a textile design class. Five days before her disappearance she had moved out of a flat she had shared with her boyfriend since arriving in March and rented a room with a family newly-arrived from Hong Kong, police said. Miss Lee made an emotional appeal for public help in solving the murder and said her family was devastated by the news of the death. ''I don't know why anyone would want to kill Ling-ling. ''She was very friendly and was well-liked,'' she said. ''I know from the letters she wrote me that she enjoyed being in Australia and wanted to stay as long as possible. How could someone murder her and leave her body behind?'' Last week Miss Lee spent an afternoon at the small clearing in the Royal National Park 20 kilometres south of Sydney where her sister's body was discovered on September 1. A camper on an afternoon hike found the body, which had been covered with palm leaves and vegetation, just 100 metres from a popular walking track near Garie Beach. Miss Lee said: ''I will try to help the police with as much as I know about my sister while I am here. ''I asked to be taken to the spot to see where she was found just to see it for myself . . . to see how she died.'' Detective Senior Constable Andrew O'Reilly told the South China Morning Post that a post-mortem examination had been unable to reveal the cause of death. ''There doesn't appear to be much sign of a struggle at the scene, so we aren't sure whether her body was dumped there or whether she was killed at the scene,'' he said. He said police had talked to Lee's former boyfriend, who told detectives he spoke to her on the telephone two days before she vanished and said all appeared to be well. Five former Hong Kong police officers attached to the New South Wales Drug Enforcement Agency have been asked to help with the investigation. Police are circulating information about the murder through Sydney's Chinatown and the Chinese media in a bid for fresh clues. Constable O'Reilly said: ''We're hoping to get the message across the language barrier so that anyone who might be able to help will come forward.'' Lee came to Australia to join her boyfriend after a divorce in Hong Kong. She is survived by a 17-year-old son and a six-year-old daughter, who remained in Hong Kong, from her marriage.