The wife, Wong Siew-fing, and 16-year-old daughter Lily were found by the roadside in a locked yellow Mini Cooper in 2015 Police found a deflated yoga ball in the back of the car HONG KONG: A Malaysian professor was jailed for life in Hong Kong Wednesday for murdering his wife and teenage daughter using a yoga ball filled with carbon monoxide which he had placed in their car. Khaw Kim-sun, 53, shook his head and looked at his three other children sitting in court on hearing the verdict, broadcaster RTHK reported. One of them burst into tears. Prosecutors had told the High Court that Khaw left the inflatable ball in the boot of a car and the gas leaked out and killed them. His wife Wong Siew-fing and 16-year-old daughter Lily were found by the roadside in a locked yellow Mini Cooper in 2015 in a case which initially baffled police. The pair were certified dead at the same hospital where Khaw worked and a post-mortem concluded they had died from inhaling carbon monoxide. Police found a deflated yoga ball in the back of the car. Prosecutors accused Khaw, a specialist in anaesthesiology and an associate professor at the Chinese University of Hong Kong, of hatching a murder plot because he was having an affair with a student. The court heard earlier in the trial that Khaw had told colleagues he planned to use the gas on rabbits. He later told police he had taken it to get rid of rats at home. The professor also told police after his arrest that Lily knew about the dangerous gas in the yoga ball, and suggested she may have wanted to commit suicide. Khaw’s case was the second murder investigation involving an academic in recent months. In August a University of Hong Kong professor was arrested on suspicion of killing his wife after police found a body stuffed in a suitcase in his office.