An anesthesiologist convicted of killing his wife and her 16-year-old daughter, Lily Khaw Li Ling. by placing a yoga ball that leaked carbon monoxide in their car has been sentenced to life in prison in Hong Kong.
After  a 53-year-old doctor in Hong Kong, Khaw Kim Sun, had become estranged from his wife, Wong Siew-Fung, 47, and their four children, however they continued to live together while he carried on an affair with a student.
Khaw, a Malaysian citizen practising in Hong Kong was convicted Wednesday after seven hours of jury deliberation. He had decided to kill his wife because she would not grant him a divorce, prosecutors said.
‘It is shocking that a highly educated and successful man would conjure up such a calculated method to get rid of his wife,’ judge Judianna Barnes Wai-Ling told Khaw.

Wong and their 16-year-old daughter were found unconscious in the car parked at a bus stop about an hour after leaving home.
Both Wong and her daughter were found unresponsive in their car two hours later by a jogger and others, who called an ambulance for them.
It was too late for doctors to save their lives when they arrived at Prince of Wales Hospital in Sha Tin, the very hospital Khaw Kim Sun worked at.
They were later declared dead from severe carbon monoxide poisoning, although their vehicle showed no defects such as a leaky emissions system.

Various items, including a deflated yoga ball, were found in the trunk of the car where the victims were found dead at Sai Sha Road in Hong Kong’s Sai Kung district

The defence also argued Khaw had an alibi. With a concentration so high it could cause someone to pass out in minutes, the defence argued. It would require the ball to have been planted right before the car was driven away, still leaking the gas.
That would clear Khaw from being the perpetrator, because he left home at about noon for a university seminar.

This was debunked by a domestic helper employed by the family, who testified that they had no rodent problem.
While Khaw stood to inherit considerable amounts of property co-owned with Wong following her death, there was no apparent motive for killing his daughter, leading to speculation that her death was unintentional.
However, he had allegedly told his younger daughter to finish her homework at home.
Khaw’s other children reportedly cried when the verdict was announced, while he only shook his head.