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Supreme Court 16 December 2011

R v MB

[2011] NSWSC 1376

Sexual offencesAssault & violenceHomicide
CRIMINAL LAW MANSLAUGHTER SEXUAL ABUSE SENTENCE

Citation: R v MB [2011] NSWSC 1376
Court: Supreme Court of New South Wales
Date: 16 December 2011
Judge(s): RS Hulme J

Background

The offender, aged 16 years and 8 months at the time of the offence, was convicted by a jury of the manslaughter of a man he walked to the victim's home in the early hours of 22 September 2008. He carried a boning knife, gloves, and a torch. When the victim opened his front door, the offender stabbed him multiple times.

Following the killing, the offender took cash and a laptop computer, burned the victim's house to destroy evidence, drove away in the victim's car, and made a further attempt to destroy blood-stained clothing. He was arrested later that afternoon and had been in custody ever since.

The offender had a deeply troubled background. He had experienced significant family dysfunction, bullying, and what the court accepted was a history of serious mental disturbance, including auditory hallucinations, self-harm, and suicidal ideation. He also gave evidence that the deceased had sexually abused him, and that on the night of the killing he was hearing voices directing him to kill the deceased.

  • Whether the partial defence of substantial impairment by abnormality of mind provided the basis for the jury's manslaughter verdict, and what weight to give that finding at sentencing
  • What sentence was appropriate for manslaughter committed by a juvenile offender with a serious history of mental disturbance
  • Whether special circumstances existed to justify a departure from the standard ratio of non-parole period to head sentence
  • Whether the offender should be ordered to serve his non-parole period as a juvenile offender under the Children (Criminal Proceedings) Act 1987

Decision

Hulme J accepted that the jury's verdict of manslaughter rested on the partial defence of substantial impairment by abnormality of mind, finding on the balance of probabilities that this was the most likely basis for the acquittal on murder. His Honour also found that the offence was not committed in consequence of a loss of self-control, and that the offender's intent precluded a simple unlawful and dangerous act manslaughter.

The court considered the offender's personal history in significant detail. It accepted that he had experienced genuine mental disturbance for several years prior to the offence, including auditory hallucinations, behavioural instability, self-harm, and a history of suicidal ideation. His Honour found that his abnormality of mind was not at the lower end of the scale, and that a range of mitigating factors applied, including his youth, his troubled background, and the sexual abuse he had suffered at the hands of the deceased.

On the question of special circumstances, Hulme J found that the offender's status as a first-time prisoner, combined with the need for extended supervision relating to his mental condition and risk of drug relapse, justified a departure from the standard non-parole ratio. His Honour was separately satisfied that special circumstances existed under the Children (Criminal Proceedings) Act 1987 warranting the offender's detention as a juvenile offender. Those circumstances included the offender's vulnerability due to mental illness, the suitability of programmes available only in detention centres, and an unacceptable risk of harm he would face in an adult correctional centre given his youth and mental abnormality.

Orders Made

  • The offender was sentenced to imprisonment with a non-parole period of 4 years and 6 months commencing 22 September 2008, together with a further period of 2 years and 6 months commencing 22 March 2013 (total sentence: 7 years)
  • The whole of the non-parole period was ordered to be served as a juvenile offender
  • The date upon which the offender would become eligible for parole was recorded as 22 March 2013

Key Takeaways

  • Where a jury acquits on murder and convicts of manslaughter, a sentencing court must identify the most likely basis for the verdict before approaching sentence; here, the court was satisfied the verdict rested on the partial defence of substantial impairment by abnormality of mind.
  • Substantial impairment by abnormality of mind admits of degrees: the court noted that impairment may range from cases that barely meet the threshold to those at the most serious end, and that the offender's longstanding psychiatric history placed him well above the minimum.
  • Under s 19(1A) of the Children (Criminal Proceedings) Act 1987, detention as a juvenile offender may be ordered where special circumstances exist, including where the offender is vulnerable due to mental illness and would face an unacceptable risk of harm in an adult correctional centre.
  • A finding of special circumstances justified extending the parole period beyond the standard ratio, on the basis that first-time imprisonment combined with ongoing mental health needs and drug relapse risk warranted longer post-release supervision.
  • The sexual abuse perpetrated by the deceased against the offender was treated as a significant mitigating factor, forming part of the court's assessment of the overall circumstances that gave rise to the offending.

Legislation and Cases Referenced

Legislation:
- Children (Criminal Proceedings) Act 1987 (NSW)
- Crimes (Sentencing Procedure) Act 1999 (NSW)

Cases:
- R v AGR (unreported, NSWCCA, 24 July 1998)
- R v Gordon (unreported, NSWCCA, 7 February 1994)
- R v Hearne [2001] NSWCCA 37; (2001) 124 A Crim R 451
- R v Hemsley [2004] NSWCCA 228
- R v NR [2011] NSWSC 280