Case Details
- Citation: [2022] SGCA 30
- Title: Daryati v Public Prosecutor
- Court: Court of Appeal of the Republic of Singapore
- Date: 31 March 2022
- Case Type: Criminal Appeal
- Criminal Appeal No: Criminal Appeal No 14 of 2021
- Judgment Type: Ex tempore judgment
- Judges: Andrew Phang Boon Leong JCA, Steven Chong JCA and Chao Hick Tin SJ
- Appellant: Daryati
- Respondent: Public Prosecutor
- Legal Areas: Criminal Law — Offences; Criminal Law — Special exceptions
- Offence: Murder under s 300(c) of the Penal Code
- Defence in issue: Diminished responsibility (Exception 7 to s 300 of the Penal Code)
- Key factual context: Indonesian national domestic helper convicted for the murder of her employer, Mdm Seow Kim Choo
- Prior decision: Public Prosecutor v Daryati [2021] SGHC 135
- Judgment length: 14 pages, 3,997 words
- Cases cited (as provided): [2021] SGHC 135; [2022] SGCA 30
Summary
Daryati v Public Prosecutor [2022] SGCA 30 concerned an appeal against a conviction for murder under s 300(c) of the Penal Code (Cap 224, 2008 Rev Ed). The appellant, an Indonesian domestic helper, sought to rely on the special defence of diminished responsibility under Exception 7 to s 300. The central question before the Court of Appeal was whether, at the time of the killing, the appellant was suffering from an abnormality of mind arising from a recognised mental condition—specifically, persistent depressive disorder with intermittent depressive disorder—and whether that abnormality substantially impaired her mental responsibility for her acts and omissions.
The Court of Appeal rejected the defence. Applying the established three-limb framework for diminished responsibility, the court held that the second limb was not proven because the expert evidence was not accepted: the diagnosis lacked the requisite factual substratum and was not supported by sound reasons. The court further agreed that the first and third limbs were also not satisfied. In practical terms, the appeal failed because the appellant could not establish that she was labouring under a qualifying abnormality of mind that substantially impaired her mental responsibility at the material time.
What Were the Facts of This Case?
The appellant, Daryati, was employed as a domestic helper by the deceased, Mdm Seow Kim Choo, and her family. The prosecution case (as reflected in the Court of Appeal’s discussion) was that the appellant killed the deceased in circumstances that supported liability for murder under s 300(c). The appeal did not turn on whether the killing occurred, but on whether the appellant could avail herself of diminished responsibility as a special exception to murder.
At trial, the appellant’s defence was psychiatric in nature. She argued that her mental state at the time of the offence was affected by persistent depressive disorder with intermittent depressive disorder. This condition, she contended, constituted an abnormality of mind that arose from disease and substantially impaired her mental responsibility. The defence therefore required the court to scrutinise expert psychiatric evidence and to evaluate whether the diagnostic criteria were met on the evidence available.
Two competing expert views were central. Dr Tommy Tan supported the appellant’s diagnosis and linked it to a heightened state of arousal and an increased propensity to violence. By contrast, Dr Jaydip Sarkar’s evidence (and the trial judge’s assessment of the evidence as a whole) did not accept that the appellant met the diagnostic and evidential requirements for diminished responsibility. The Court of Appeal emphasised that the diminished responsibility inquiry is not a mere “diagnosis label” exercise; it is a legal test that depends on whether the abnormality of mind is established on the evidence and whether it substantially impaired mental responsibility.
The Court of Appeal’s reasoning relied heavily on the factual record bearing on functional impairment and symptom consistency. The court noted that there was objective evidence and evidence from the appellant herself indicating that she did not experience functional impairment during her employment in Singapore. Her employers and close contacts did not report changes in her work performance. She testified that she could handle her job scope and complete her assigned chores daily, despite difficulty focusing. The court also considered her ability to plan and reason: she allegedly plotted to steal money, retrieve her passport, and escape, including drawing a map of the house layout and choosing a strategic time to strike. Social functioning was also considered, including her ability to form relationships and receive assistance from other migrant workers.
What Were the Key Legal Issues?
The primary legal issue was whether the appellant satisfied the defence of diminished responsibility under Exception 7 to s 300 of the Penal Code. Exception 7 provides that culpability for murder may be reduced where the accused proves that, at the time of the act causing death, she was suffering from an abnormality of mind that substantially impaired her mental responsibility for her acts and omissions in relation to the offence.
Within that overall issue, the Court of Appeal focused on the three elements of the defence as articulated in Nagaenthran a/l K Dharmalingam v Public Prosecutor and another appeal [2019] 2 SLR 216. These elements are: (a) an abnormality of mind (first limb); (b) that abnormality arose from a recognised source such as arrested or retarded development, inherent causes, or disease or injury (second limb); and (c) the abnormality substantially impaired mental responsibility (third limb). The appeal therefore required the court to assess whether the psychiatric evidence established each limb on the balance of probabilities.
A second, closely related issue was evidential: whether the Court should accept Dr Tan’s diagnosis and its factual basis. The Court of Appeal’s approach indicates that even where an expert offers a diagnosis, the court must still examine whether the diagnosis is supported by the factual substratum and whether the expert’s reasoning addresses contradictions and key diagnostic criteria—particularly functional impairment and symptom consistency.
How Did the Court Analyse the Issues?
The Court of Appeal began by setting out the three-limb test for diminished responsibility and then applied it to the evidence. The court’s analysis was structured around the appellant’s submissions and the trial judge’s findings. It agreed with the trial judge that the second limb remained unproven because the court was unable to accept Dr Tan’s evidence. Once the second limb failed, the defence could not succeed, but the Court of Appeal also addressed the first and third limbs to confirm that the defence was not made out.
On the second limb, the Court of Appeal scrutinised Dr Tan’s diagnosis against the DSM-5 diagnostic criteria. Dr Tan opined that the appellant had persistent depressive disorder even before coming to Singapore and continued to have it after arrival, with a relapse of a major depressive disorder episode when she started work in Singapore. Dr Tan’s diagnosis was based on symptoms the appellant allegedly displayed during her employment, including depressed mood, eating less, loss of weight, difficulty sleeping and crying at night, lethargy, thoughts of missing loved ones and not wanting to work in Singapore, and thoughts of dying.
The Court of Appeal rejected Dr Tan’s evidence for a fundamental reason: Dr Tan’s report omitted to account for functional impairment, which the court treated as an important diagnostic component for persistent depressive disorder or major depressive disorder. The court found clear objective evidence and evidence from the appellant herself that she did not experience functional impairment in either Indonesia or Singapore. This omission mattered because diminished responsibility is concerned with the accused’s mental responsibility in relation to the offence, and functional impairment is a key indicator that the mental condition is sufficiently pervasive to affect the accused’s functioning.
The Court of Appeal also found that the symptoms relied on by Dr Tan were largely derived from the appellant’s self-reported account and were not verified against objective evidence that would have been available. The court identified that several symptoms—depressed mood, eating less, loss of weight, and suicidal thoughts—were inconsistent with the objective evidence and with the appellant’s own testimony at trial. When Dr Tan was confronted with evidence negating these symptoms, Dr Tan maintained the diagnosis without adequate justification. The Court of Appeal therefore held that there was no sound factual substratum for the diagnosis and that the expert’s reasoning did not sufficiently engage with contradictions.
In elaborating, the Court of Appeal relied on multiple strands of factual evidence. First, it noted that the appellant’s co-worker, the deceased’s husband, and the deceased’s eldest son did not report changes in her work performance to Dr Sarkar. Second, the appellant herself testified that she could handle her job scope and complete chores daily, even if she had difficulty focusing. Third, the court considered the appellant’s planning behaviour. The plotting to steal money, retrieve her passport, and escape was treated as evidence of the ability to plan ahead and reason clearly. The court also considered social functioning: she formed relationships and received support from other migrant workers, which further undermined the claim of significant functional impairment.
Fourth, the Court of Appeal considered the appellant’s functioning in Indonesia. It found that she did not suffer from functional impairment there either. She had completed high school, worked at a prawn factory for about two years, and attended training for domestic helper work. At the factory and training centre, she had no problems with work, made friends, and formed a romantic relationship. Dr Tan, in cross-examination, accepted that the appellant did not show functional impairment in Indonesia and that, based on what she said in court, she did not show signs of functional impairment in Singapore. These admissions reinforced the Court of Appeal’s conclusion that the diagnostic criteria were not satisfied on the evidence.
Beyond functional impairment, the Court of Appeal also found insufficient evidence for four key symptoms relied on by Dr Tan: depressed mood, eating less, loss of appetite, and suicidal thoughts. The court held that the appellant’s self-reported account to Dr Tan on these matters was negated by her trial testimony and by objective evidence. While the court accepted that the appellant might be “closed-off” and therefore not outwardly display mood changes to others, it still found a large discrepancy between her testimony in court and the account she gave Dr Tan. The court further observed that her contemporaneous diary entries did not align with the narrative presented to Dr Tan, suggesting that the expert’s reliance on the appellant’s account was not sufficiently reliable.
Although the Court of Appeal’s rejection of Dr Tan’s evidence was decisive for the second limb, it also agreed with the trial judge that the first and third limbs were not satisfied. The first limb concerns whether the accused was suffering from an abnormality of mind. The court’s findings on the lack of functional impairment, the inconsistencies in symptom reporting, and the evidence of planning and reasoning supported the conclusion that an abnormality of mind was not established. The third limb concerns whether the abnormality substantially impaired mental responsibility. Given the failure to prove the second limb, and the court’s view that the evidence did not support a sufficiently disabling mental condition at the material time, the court concluded that substantial impairment was not proven.
What Was the Outcome?
The Court of Appeal dismissed the appellant’s appeal and upheld the conviction for murder under s 300(c). The diminished responsibility defence under Exception 7 to s 300 was not made out because the appellant failed to prove the second limb, and the court also agreed that the first and third limbs were not satisfied.
As a result, the conviction stood, and the appellant did not obtain a reduction of liability from murder to culpable homicide not amounting to murder (the typical legal consequence when diminished responsibility is successfully established).
Why Does This Case Matter?
Daryati v Public Prosecutor is significant for practitioners because it illustrates how Singapore courts evaluate diminished responsibility claims in a structured, evidence-sensitive manner. The decision reinforces that diminished responsibility is not established merely by obtaining an expert diagnosis. Courts will scrutinise whether the diagnosis is anchored in a reliable factual substratum, whether key diagnostic criteria are addressed (including functional impairment), and whether the expert’s reasoning adequately confronts contradictions.
The case also demonstrates the importance of consistency between expert reports and the accused’s contemporaneous records and trial testimony. Where an expert’s opinion relies heavily on self-reported symptoms that are later contradicted by objective evidence or by the accused’s own evidence, the court may reject the expert evidence. This has practical implications for defence counsel: psychiatric reports must be carefully prepared with attention to evidential corroboration, and experts should be instructed to address inconsistencies rather than maintain conclusions despite contrary evidence.
Finally, the decision highlights the evidential weight courts may give to behavioural indicators that bear on planning, reasoning, and functional capacity. While such evidence does not automatically negate mental illness, it can be highly relevant to whether the accused’s mental responsibility was substantially impaired at the material time. For law students and criminal practitioners, the case provides a clear example of how the three-limb test operates in practice and how the second limb can be fatal to the defence when the diagnosis is not supported by the evidence.
Legislation Referenced
- Penal Code (Cap 224, 2008 Rev Ed), s 300(c) [CDN] [SSO]
- Penal Code (Cap 224, 2008 Rev Ed), Exception 7 to s 300 (diminished responsibility)
Cases Cited
- Nagaenthran a/l K Dharmalingam v Public Prosecutor and another appeal [2019] 2 SLR 216
- Public Prosecutor v Daryati [2021] SGHC 135
- Daryati v Public Prosecutor [2022] SGCA 30
Source Documents
This article analyses [2022] SGCA 30 for legal research and educational purposes. It does not constitute legal advice. Readers should consult the full judgment for the Court's complete reasoning.