[2][3] Below a flat at Circuit Road, the first victim, an 18-year-old girl, was allegedly thrown off the 15th floor of the HDB block, and died upon reaching the void deck.

Police investigations classified the case as murder, based on the sightings and signs of foul play left at the crime scene.

Her 41-year-old father Ng Sea Lim, a fisherman, told the police that on that night itself, his daughter informed him that she was going to East Coast Park to have a barbeque party with her best friend "Alice" and a few others.

[7][8] Foo was found with 14 stab wounds on her body when she was first discovered dead at the bird sanctuary area of East Coast Park.

He stated that nearing the day of the murder, he was dissatisfied with Foo for not reciprocating his feelings despite his best efforts to treat her well and having sex with her several times in the past.

The murder weapon was eventually recovered from the area where Ng told and led the police to during the search for the knife.

Defence lawyers Loh Lin Kok and Cheong Aik Chye represented Ng throughout the trial.

[21] In his new testimony to the court, Ng claimed that after he first met the women on 2 January 1990 instead of a year ago as previously said, he felt that Ng Lee Kheng and Foo had allegedly placed a charm on him, causing him to often feel drowsy whenever he was hanging out with the women, and he also felt the same feeling when he tried to have sex with Foo, which he claimed the feeling led to him losing his interest in sex half-way,[22] and thus he planned to kill the women due to the charm, which was his reason why he bought the knife (the same murder weapon used to kill Foo).

He was also spent 18 months inside a boys home and even underwent two years of reformative training for burglary and theft offences during his youth.

[32][33][34] Dr Wong Yip Chong, a famous psychiatrist (who was known for his assessment of child killer Adrian Lim), testified that Ng suffered from three psychiatric disorders at the time he killed Foo, mainly a borderline personality disorder, brief reactive psychosis and acute idiosyncratic intoxication.

Ng's actions did not result from psychosis as it was an emotional killing rather than bizarre behaviour due to his jealousy of being rejected by Foo,[38] and besides, if Ng suffered from acute idiosyncratic intoxication, he would not have been able to calmly return home to watch television and act normally as always in the aftermath of the violent outburst, and his interest in sexual activity would have diminished if he indeed had depression.

Since the murder of Foo was a crime of passion and Ng was in full control of himself at the time, his defence of diminished responsibility was not to be accepted.

[42] In his judgement, Justice Sinnathuray stated that he was satisfied on the balance of probabilities that Ng was not suffering from diminished responsibility at the time of Foo's murder, and he accepted the psychiatric evidence of the prosecution.

[45] Reportedly, Foo's mother broke down as she heard the trial judge saying her daughter's name, and after Ng's guilty verdict of murder and death penalty were passed, Foo's mother tearfully told the press in Chinese that her daughter died an extremely terrible death.

[46] On 3 December 1993, Ng Soo Hin's appeal was dismissed by the Court of Appeal, with the three judges L P Thean, Goh Joon Seng and Warren Khoo affirming Justice Sinnathuray's verdict that Ng was fully conscious of his actions and indeed committed the premeditated murder of Foo Chin Chin due to jealousy.