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Supreme Court 6 May 2026

R v Doble

[2026] NSWSC 469

Assault & violenceHomicide
SENTENCING MURDER OFFENDER SET FIRE TO HIS MOTHER’S HOUSE MORAL CULPABILITY POST TRAUMATIC STRESS DISORDER SOME REDUCTION IN MORAL CULPABILITY

Citation: R v Doble [2026] NSWSC 469
Court: Supreme Court of New South Wales
Date: 6 May 2026
Judge(s): Lonergan J

Background

The offender, a 42-year-old man, was living in a modified bus on his 65-year-old mother's rural property near Young, NSW. A 16-year-old (referred to by the pseudonym "Jenifer") was staying at the property during the school holidays. In the days leading up to the offence, the offender became increasingly hostile towards his mother over trivial household disputes, including a missing chuck key, and made threats to burn the house down and to kill her.

On 7 January 2024, following yet another argument (this time about a fuel can for the lawn mower), the offender bashed his mother repeatedly on the head with a large jerry can of petrol, set fire to her house, then poured petrol on her and set her alight, telling her: "You're going to burn bitch." Jenifer, who courageously attempted to intervene and hose the deceased with water, was pushed away and suffered burn injuries when the offender poured more petrol onto the flames. The offender then drove away. His mother died in hospital the following morning.

The offender pleaded guilty on 3 September 2025 to murder and assault occasioning actual bodily harm. Two further charges (intentionally destroying property by fire and possessing an unauthorised pistol, being a broken gel-blaster) were placed on a Form 1 referable to the murder count.

  • What was the appropriate sentence for murder committed in these circumstances, having regard to the statutory maximum of life imprisonment and the standard non-parole period of 20 years?
  • What weight should be given to the offender's guilty plea (attracting a 25% discount)?
  • Whether the offender's personality disorder, born of childhood emotional and physical abuse, reduced his moral culpability, and how this intersected with (but remained distinct from) the principles in Bugmy v The Queen.
  • What role did the offender's post-traumatic stress disorder, cannabis self-medication, and substance abuse disorder play in the sentencing assessment?
  • Whether the threats made by the offender in the days before the killing amounted to planning.
  • The appropriate approach to the Form 1 offences (arson and possession of an unauthorised firearm) taken into account in sentencing for murder.

Decision

The Crown did not submit that a life sentence should be imposed, and Lonergan J was not satisfied that one was appropriate. The court applied the Muldrock framework, treating the statutory maximum and the 20-year standard non-parole period as guideposts while assessing all relevant factors.

The court found the offender's threats in the preceding days were expressions of anger, frustration, and distress rather than evidence of planning. Nevertheless, the killing was an act of extreme violence perpetrated against a vulnerable family member in the presence of a 16-year-old, and the offender's conduct in intensifying the fire while Jenifer tried to save the deceased aggravated the offence significantly.

Central to the sentencing exercise was the psychiatric evidence concerning the offender's personality disorder, which the court found was directly born of severe childhood emotional and physical abuse. The personality disorder contributed to exaggerated anger responses and a disproportionate sense of grievance. Lonergan J held that this warranted some reduction in moral culpability. Importantly, the court treated this consideration as separate and distinct from the Bugmy principles relating to social deprivation and disadvantage, recognising it as a specific psychiatric condition that contributed causally to the offending. The offender's PTSD and his self-medication with cannabis, giving rise to a substance abuse disorder, were also taken into account.

The Form 1 offences (arson and possession of an unauthorised pistol) were dealt with in accordance with the principles set out by Spigelman CJ in Attorney General's Application No 1 of 2002, increasing the penalty for the primary offence by reference to personal deterrence and community retribution, subject to the constraints of the maximum penalty for the primary offence and the totality principle.

Orders Made

  • The offender was convicted of murder and assault occasioning actual bodily harm.
  • The Form 1 offences (destroy property by fire and possess unauthorised pistol) were taken into account.
  • A sentence of imprisonment was imposed, incorporating a 25% discount for the guilty plea. (The specific numerical sentence was contained in the truncated portion of the judgment and is not reproduced here.)

Key Takeaways

  • The Supreme Court held that a personality disorder causally linked to childhood abuse can reduce moral culpability for murder, treating this as a consideration separate and distinct from the Bugmy principles concerning background of social deprivation.
  • Prior threats to kill and burn the house down did not, on the facts, establish planning; Lonergan J characterised them as expressions of anger and distress rather than evidence of premeditation.
  • Applying the Muldrock framework, the Court treated the standard non-parole period and maximum sentence as guideposts rather than starting points, and declined to impose a life sentence in circumstances where the Crown did not seek one.
  • Self-medication with cannabis was recognised as part of a substance abuse disorder linked to PTSD, and the Court treated it as a relevant factor in the overall sentencing assessment.
  • In addressing the Form 1 offences, greater weight was given to personal deterrence and community retribution when sentencing for the primary offence of murder, following Attorney General's Application No 1 of 2002.

Legislation and Cases Referenced

Legislation:
- Crimes Act 1900 (NSW), ss 19A, 59(1), 195(1)(b)
- Crimes (Sentencing Procedure) Act 1999 (NSW), ss 33, 54A, 61(1)
- Firearms Act 1996 (NSW), s 7(1)
- Children (Criminal Proceedings) Act 1987 (NSW)
- Crimes (High Risk Offenders) Act 2006 (NSW)

Cases:
- Bugmy v The Queen (2013) 249 CLR 571; [2013] HCA 37
- Muldrock v The Queen (2011) 244 CLR 120; [2011] HCA 39
- Markarian v The Queen (2005) 228 CLR 357; [2005] HCA 25
- The Queen v Olbrich (1999) 199 CLR 270; [1999] HCA 5
- Attorney General's Application under s 37 of the Crimes (Sentencing Procedure) Act 1999 No 1 of 2002 (2002) 56 NSWLR 146; [2002] NSWCCA 518
- R v Thompson; R v Houlton (2000) 49 NSWLR 383; [2000] NSWCCA 309
- Director of Public Prosecutions (Cth) v De La Rosa (2010) 79 NSWLR 1; [2010] NSWCCA 194
- Aslan v R [2014] NSWCCA 114
- Shaw, Jason Robert v R [2008] NSWCCA 58