Anaesthesiologist Khaw Kim Sun, 60, told the High Court on Wednesday that he decided to bring the surplus carbon monoxide from his laboratory back to their three-storey Sai Kung after he had tried various pest control methods in vain.
The Malaysian, representing himself in the retrial, has denied filling an inflatable yoga ball with carbon monoxide and placing it inside the family’s yellow Mini Cooper to kill his wife Wong Siew Fing, 47, and second daughter, Lily Khaw Li Ling, 16.
The pair died in the car on May 22, 2015.
“There is no reason for me to sit here trying to defend myself if I am not innocent,” the former university professor told the jury.
He also said the timeline of his whereabouts on the day of the deaths, and other scientific evidence, would prove him to be not guilty.
