A woman poured boiling oil over her husband and stabbed him 16 times before stashing his body under their bed, a jury heard yesterday. A postmortem examination showed father-of-two Siu On, 50, had died from a combination of the knife attack and the effect of having the flesh around his face, neck and chest partially cooked by the oil, the Court of First Instance was told. His death could have also been hastened by the subsequent action of Li Suet-ping, 50, in wrapping 17 layers of plastic around his head, prosecutor Edward Laskey said. Li has pleaded not guilty to the murder of her husband, which investigators believe occurred at the couple's Tseung Kwan O home on January 5 last year. 'The real issue in this case is not that she was responsible for killing her husband but, when she was killing her husband, what was her state of mind?' Mr Laskey said. He told the court the pair had been squabbling because Siu's work at a Yuen Long mahjong school took him away for long periods. Li suspected Siu was having an affair, he said. Mr Laskey said Li told police she had boiled a pot of oil in the kitchen and poured it over her husband while her children were at school. 'He was in great pain and he asked her to help him and she stabbed him . . . and injected him with insulin she bought to commit suicide,' Mr Laskey said of Li's statement to police. Li then wrapped her husband's head in 17 layers of plastic and hid the body under their bed, where it lay undetected until January 8. That day, the Social Welfare Department's hotline received an anonymous phone call from Li asking the department to care for her children 'because they could not stay together after death'. Mr Laskey said Li told a counsellor she did not want her 14-year-old son and 16-year-old daughter returning home and 'seeing something'. Mr Laskey said Li told the hotline she had done something wrong and that her children would not forgive her. Police were alerted and officers later traced a call to a mobile phone registered in Li's name. Li was not present when police arrived at the family home, but a search of a wardrobe uncovered a number of bags which contained a bloodstained quilt, jacket, shoes, towel and key. A bent syringe was also found, the court heard. When Li returned home, she told waiting police what had occurred on January 5, Mr Laskey said. When police removed the body, Li asked to see Siu and told him to 'wait for her', he said. A medical examination found several blisters on Li's leg that were consistent with being scalded with boiling oil. The postmortem examination found Siu had sustained burns to 50 per cent of his body, with the flesh on his upper face, under the jaw, the front of the neck and the upper chest being partially cooked, Mr Laskey said. Siu's left lung was punctured during the knife attack, he said. The case continues today before Mr Justice Colin Jackson.