Background
MA was convicted after jury trial of 31 counts of sexual offences committed between December 2006 and March 2011 against two young cousins, IA and AM, when the applicant was aged 15–19 years and the victims were aged 5–11 years. The offences included aggravated indecent assault, sexual intercourse with children under 10, incitement to indecency, and sexual intercourse with children aged 10–14, contrary to sections 61M, 61O, 66A, and 66C of the Crimes Act 1900 (NSW). At the District Court sentencing on 2 May 2024, the judge imposed an aggregate sentence of 14 years imprisonment with a non-parole period of 8 years, backdated to 14 November 2023.
MA appealed on three grounds: (1) the judge failed to adequately consider his age when assessing rehabilitation and general deterrence; (2) the aggregate sentence was unreasonable or plainly unjust; and (3) fresh evidence obtained post-sentence demonstrated he suffered from intellectual disability, a fact unknown at sentencing. The Notice of Appeal was filed approximately six months out of time; MA therefore required leave to extend time as well as leave to appeal.
The Court’s Holding
The Court of Criminal Appeal (Mitchelmore JA, Dhanji J, and McNaughton J) granted leave to extend time, granted leave to appeal, and allowed the appeal. The Court admitted fresh evidence comprising a report by Dr Melissa Hughes, a clinical neuropsychologist, dated 26 September 2025, which demonstrated that MA exhibited areas of impaired cognitive functioning consistent with intellectual disability. The sentencing judge had proceeded on the basis that MA suffered from “low cognitive intelligence and equally low average emotional intelligence” but had no evidence of intellectual disability. The Court found that the failure to adduce this evidence was not a matter of forensic choice, and that admitting the fresh evidence was necessary to prevent a miscarriage of justice.
The Court held that consideration of an offender’s mental impairment does not require a bright-line distinction between formal diagnoses of intellectual disability and other persuasive evidence of cognitive impairment. MA would have been cognitively impaired at the time of the offences, and this required the Court to moderate its assessment of his moral culpability and the weight given to deterrence and denunciation. The Court then re-sentenced MA to an aggregate term of 12 years imprisonment with a non-parole period of 7 years, commencing 14 November 2023 and expiring 13 November 2035, with earliest parole eligibility on 13 November 2030.
In resentencing, the Court considered MA’s intellectual disability, his age at the time of offending, his lack of remorse or acceptance of responsibility (making rehabilitation prospects guarded), and critically, the brutal assaults MA suffered in custody. The Court acknowledged the extent and seriousness of the offending and the significant harm to the victims, but determined that these aggravating factors must be weighed against the mitigating force of youth, cognitive impairment, and custodial hardship.
Key Takeaways
- Fresh evidence of intellectual disability or cognitive impairment post-sentence may be admitted on appeal where it addresses facts existing but not appreciated at sentencing, particularly where failure to adduce it at first instance was not a matter of forensic choice.
- Sentencing courts need not await formal diagnostic criteria for intellectual disability; persuasive evidence of areas of impaired cognitive functioning may be considered to moderate moral culpability and the weight of deterrence.
- Youth remains a significant mitigating factor even in serious sexual offences, requiring careful calibration of moral culpability and the application of principles of rehabilitation and general deterrence.
- Physical and mental suffering experienced in custody, including brutal assault by other inmates, constitutes a relevant consideration in resentencing exercises.
Why It Matters
This decision reinforces that appellate courts will intervene where an offender is sentenced in the absence of evidence regarding intellectual disability or cognitive impairment, treating such omission as capable of giving rise to a miscarriage of justice. The judgment clarifies that sentencing courts need not insist upon formal diagnostic categories; the presence of demonstrated cognitive impairment, even falling short of a clinical diagnosis of intellectual disability, may significantly alter the sentencing exercise by moderating culpability and the weight of deterrent principles.
Critically, the decision demonstrates judicial recognition that young offenders with cognitive impairment require careful differential sentencing treatment, and that the presence of intellectual disability may substantially reduce the appropriateness of sentences otherwise calibrated to general deterrence. For practitioners, the judgment signals that appellate intervention on the ground of fresh evidence regarding mental impairment is available and will be taken seriously where the evidence could materially affect the exercise of sentencing discretion.
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