Pascal Najadi, the son of slain Arab-Malaysian banking group founder Hussain Ahmad Najadi, said the revised Prevention of Crime Act (PCA) would be instrumental in thwarting hired killers in their tracks.

He commended the government's move to amend the law which was approved by the Dewan Rakyat on Thursday.

The 45-year-old businessman told Bernama over the phone from Russia that the PCA could serve as an effective tool to tackle "criminals, killers and terrorists".

"It has to ensure that the people are well protected from evil-doers and hardcore criminals," said Pascal.

The approved Prevention of Crime (Amendment and Extension) 2013 Bill, among others, provides for detention without trial to maintain public order and safety.

Hussain Ahmad Najadi, 75, was gunned down at a car park in Lorong Ceylon here on July 29. A 49-year-old woman was also injured in the attack.

Car repossessor Koong Swee Kwan, 44, was charged with the murder on Thursday. He was also charged with attempting to murder the woman, Cheong Mei Kuen.

Pascal expressed his gratitude to the Malaysian police for their swift action and hoped the authorities would be able to arrest the mastermind behind the murder, a 53-year-old businessman who is reportedly hiding in Australia.