Jimmy Chua Chap Seng (蔡捷成), born 28 August 1947 in Singapore and nicknamed Hokkien Chai, was a former Singapore Police Force investigator dismissed after a 1972 bribery conviction. He later turned to crime in Malaysia, allegedly leading a secret society and dealing in illegal firearms.
On 8 February 1984, while committing vehicle theft in Kuala Lumpur, Chua was being arrested by Police Constable Mohamed Yassin bin Ismail when he seized the officer's pistol and shot him three times at point-blank range. PC Mohamed Yassin, 27, died about an hour later. Chua evaded capture for six days before being arrested on 14 February 1984 in possession of a .32 Llama pistol and ammunition, resulting in murder and firearms charges, either of which carried the death penalty under Malaysian law. He was remanded at Pudu Prison from August 1984, briefly escaping from hospital custody in April 1985 before being recaptured.
On 17 October 1986, Chua and five other inmates — Lam Hok Sung, Ng Lai Huat, Sim Ah Lan, Pang Boon Boo, and Yap See Keong — took two prison medical staff, Dr. Radzi Jaffar and laboratory technician Abdul Aziz Abdul Majid, hostage during a routine medical checkup, using improvised weapons. The group demanded reduced charges, vehicles, and money in exchange for the hostages' release. Authorities, led by Prisons Department director-general Datuk Ibrahim Mohamed and under instructions from Prime Minister Mahathir Mohamad to avoid bloodshed, refused to concede to the demands. After six days, inmate Pang Boon Boo covertly cooperated with police, enabling a raid that ended the siege without fatalities; both hostages were rescued unharmed.
On 21 November 1986, in a separate case concerning his firearms offences under the Internal Security Act, Chua was convicted and sentenced to death by the Kuala Lumpur High Court. His final appeal was dismissed by the Supreme Court of Malaysia on 19 September 1988, and he was hanged at Pudu Prison on 10 October 1989, aged 42. Because of his death, Chua was never tried for the hostage-taking.
Chua's five accomplices were charged with kidnapping for ransom, which could have carried the death penalty, but the prosecution's case relied heavily on Chua's alleged ransom demands. Defense lawyers, including Karpal Singh, successfully argued this could not be admitted as hearsay evidence without Chua available for cross-examination. On 16 March 1990, all five pleaded guilty to reduced charges of wrongful confinement and abduction; Yap See Keong and Pang Boon Boo were sentenced to three years each, while the remaining three received five years each. Lam Hok Sung was separately sentenced to death for a firearms offence in 1988 in another case.
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