A JEALOUS wife who accused her husband of adultery killed him yesterday in a frenzy of violence and then jumped to her death from the 18th floor. Police said Tong Yee-man, 50, who was married to Yiu Kwai-sun, 55, for 30 years, hit him on the head and then stabbed him in the back more than 20 times with a pair of 18-centimetre fruit knives as he lay on their marital bed. Police said the blow to the head was fatal and the stab wounds were so extensive they were unable to count them. Tong left her husband with a knife sticking out of his back. She wrote a suicide note, then put a chair on the balcony, climbed on to it and jumped to her death. Police were called to Lok Yiu House on Kwai Chung's Lai Yiu Estate at 10.40 am and found Tong lying unconscious on the ground floor. She was rushed to Princess Margaret Hospital but was dead on arrival. It is believed that in her suicide note Tong accused her husband of having an affair with a woman in China. Neighbours reacted to the deaths yesterday with shock and disbelief. ''I just don't believe it. Tong was so cheerful, they were such a lovely couple,'' said one neighbour. ''They never disagreed in public, never mind fighting or arguing.'' ''I saw them going to the tea house together quite often.'' Few neighbours believed Yiu was an unfaithful husband. ''It is impossible to relate this murder to any extramarital affair. He was a nice man and would not do such a thing,'' said one neighbour. But another described Tong as an open-minded wife who would permit her husband to flirt around with other women. ''Tong was an optimistic person. She told me once that men were all the same - they liked going out to find women. She would not mind if Mr Yiu had an affair with a woman as long as he kept paying the family bills.'' The couple had two sons aged 28 and 25, and a 19-year-old daughter. The youngest son and daughter told police they left home at 9 pm on Thursday after they saw their parents arguing and did not return until 6 am. Yiu, a decorator, had been made redundant recently. One neighbour said she believed his unemployment played a big part in the tragedy. ''I heard Yiu shout to Tong in foul language, saying 'no job, no money to pay for meals' when I took out the garbage at night,'' she said. Tong had served dim sum in a Cheung Kong seafood restaurant for 17 years. She resigned a year ago after having an appendix operation and suffering back pain, neighbours said. ''Tong might have asked Yiu for money to see a doctor. But Yiu was unemployed and not able to pay for Tong's medical fees,'' said the neighbour. ''Tong looked very miserable lately. I saw her yesterday with her eyes looking down and her face looking pale. ''She looked like something was really bothering her.''