The evening run
On the night of May 10, 2020, Tay Rui Hao left home for a regular jog in Punggol. Singapore was then under its COVID-19 circuit-breaker restrictions, and Tay had taken up running several times a week during that period.
At about 11:08 p.m., Tay was attacked near a bus stop along Punggol Field Road. Court reporting established that the attacker, Surajsrikan Diwakar Mani Tripathi, did not know him. After the assault, Tay was still able to seek emergency help. He was taken to Sengkang General Hospital but died from his injuries.
A victim chosen at random
The prosecution case described the killing as a stranger attack. Surajsrikan had gone out carrying a folding knife. He had been experiencing anger connected with his own personal circumstances and, after Tay jogged past, chased and attacked him.
Those circumstances were discussed at sentencing because they formed part of the offender's psychological history. They do not amount to a reason connected to Tay. The victim was simply passing through the same public space and had no known dispute, relationship or prior contact with the person who killed him.
The police investigation
Investigators used surveillance-camera recordings from the area to reconstruct movements after the attack. The footage helped identify Surajsrikan, who was arrested at his home on May 16, six days after Tay's death.
Police recovered the folding knife from his bedroom. Reporting on the agreed facts stated that Tay's blood was found on the weapon and on Surajsrikan's footwear. The combination of surveillance and forensic evidence provided a strong evidentiary trail connecting the arrested man to the attack.
Psychiatric evidence
During remand, Surajsrikan underwent psychiatric assessment. The court heard that he had severe social anxiety disorder, obsessive-compulsive disorder and dyscalculia, as well as borderline-to-low intellectual functioning. The assessments did not find that these conditions deprived him of criminal responsibility or amounted to diminished responsibility for the murder.
This distinction matters. Mental-health diagnoses can be relevant to sentencing and clinical treatment, but a diagnosis does not automatically establish a legal defense. In this case, the prosecution and court treated Surajsrikan as criminally responsible for the killing.
Guilty plea and sentence
On September 15, 2022, Surajsrikan pleaded guilty in the High Court to murder under the provision covering an intentional bodily injury sufficient in the ordinary course of nature to cause death. The prosecution did not seek the death penalty.
Justice Dedar Singh Gill sentenced him to life imprisonment and 15 strokes of the cane. Prosecutors had sought a higher number of strokes, while the defense asked that caning not be imposed. The court selected life imprisonment rather than capital punishment while still imposing corporal punishment permitted under Singapore law.
Why the case is classified as solved
The evidentiary and procedural status is not ambiguous. Surajsrikan admitted the murder in court, the plea was accepted, and sentence was imposed. There is no unresolved question in the reviewed record about the legal identity of the person convicted of killing Tay.
The broader emotional explanations offered in court should not be confused with a dispute over responsibility. They describe factors in the offender's history; they do not create uncertainty about Tay's innocence or about the conviction.
Timeline
May 10, 2020: Tay Rui Hao goes jogging in Punggol and is attacked near Punggol Field Road.
May 10–11, 2020: Tay is taken to hospital and dies from his injuries.
May 16, 2020: Surajsrikan Diwakar Mani Tripathi is arrested at his home after police trace him through surveillance footage.
2020–2022: the accused remains in custody and undergoes psychiatric assessment.
September 15, 2022: Surajsrikan pleads guilty to murder and receives life imprisonment plus 15 strokes of the cane.
2026: the conviction remains the controlling legal outcome in the reliable sources reviewed for this file.
Current status
The case is classified Solved / Adjudicated. Surajsrikan Diwakar Mani Tripathi was convicted on his guilty plea and sentenced to life imprisonment and caning for the murder of Tay Rui Hao.