On 11 August 1998, 43-year-old Ooi Ang Yen (黄红燕 Huáng Hóngyàn), a divorced mother of four and a factory production worker, was stabbed to death by her ex-boyfriend at a carpark nearby her workplace in Bukit Merah, Singapore.

Her 41-year-old boyfriend and married father of two, Chan Chim Yee (陈振义 Chén Zhènyì), was arrested 12 days later and charged with murder.

[1] On the evening of 11 August 1998, at a carpark outside her workplace in Bukit Merah, a female factory worker was attacked by a knife-wielding man, who stabbed her several times on the arm, throat and chest before he fled the scene.

The victim, identified as 43-year-old Ooi Ang Yen, was tended at the scene by her colleagues,[2] and she was later pronounced dead 20 minutes after arriving at Alexandra Hospital.

[6] According to the forensic pathologist, Dr Paul Chui, who conducted an autopsy on the victim, he found at least two stab wounds on the chest of Ooi.

[12] First-hand information revealed that prior to the stabbing, Ooi was formerly married with four children when she first met her ex-boyfriend,[13] a former seaman with whom she had a relationship after they travelled to China together,[14][15] and this affair was what resulted in the couple's divorce a year before the murder.

[24] 12 days after the brutal killing, on 23 August 1998, following an informant's tip-off, the police managed to arrest Ooi Ang Yen's ex-boyfriend, who was spotted having a meal at a coffee shop in Toa Payoh.

[28] On 25 October 1999, 41-year-old Chan Chim Yee officially stood trial at the High Court for one count of murdering Ooi Ang Yen in August 1998.

[40] Chan's supervisor Chua Cheng Kang and another co-worker, Adeline Tay Chay Kin, from his workplace, were also summoned to testify for the prosecution.

Chan's counsel called upon two security guards - Mahmood Osman and Vincent Wong Chun Keong - to testify on his behalf.

Justice Kan also touched on the second defence of diminished responsibility, declaring that Chan had not proven that he suffered from an abnormality of the mind at the time of the murder, and Dr Kong's psychiatric report did not satisfactorily support his defence, given that Dr Gwee's diagnosis was more credible to provide a full assessment of Chan's state of mind at the time of the murder.

[59] In February 2000, the case of Ooi's murder was one of the ten most high-profile acts of violence against women in Singapore that happened during the past few years.

[60][61] On 15 September 2000, eight months after losing his appeal, 43-year-old Chan Chim Yee was hanged in Changi Prison at dawn for murdering Ooi Ang Yen back in 1998.