Murder and manslaughter in New South Wales.

What is the difference between murder and manslaughter in NSW?

Both offences come from section 18 of the Crimes Act 1900, and both are unlawful killings. The difference is fault. Murder needs a particular guilty state of mind. Manslaughter is what is left over: every unlawful killing that is not murder. The section puts it that way itself. Murder is defined by four mental states, and then the Act says that "every other punishable homicide" is manslaughter. So the question in a homicide case is rarely whether the accused caused the death. It is what was in the accused's mind when they did.

That line matters because the penalties are far apart. Murder carries a maximum of imprisonment for life. Manslaughter carries a maximum of 25 years. A jury that is not sure the accused had the state of mind for murder can still convict of manslaughter, so the two offences travel together through a trial. The full text of the Act is on the NSW legislation site, and the New South Wales Office of the Director of Public Prosecutions sets out how it prosecutes homicide.

What does the prosecution have to prove for murder?

The Crown must first prove that the accused's act caused the death. Causation is a question for the jury, guided by the test the High Court set in Royall v The Queen (1991) 172 CLR 378, available on JADE. The act must be a substantial or significant cause of death, not a trivial one.

The Crown must then prove one of four fault elements. The first is an intent to kill. The second is an intent to inflict grievous bodily harm, which means bodily injury of a really serious kind. The third is reckless indifference to human life, which the courts read as foresight of the probability of death. It is not enough that the accused saw death as a possibility; they must have foreseen it as probable and pressed on regardless. The fourth is constructive murder, sometimes called felony murder, where the death happens during or immediately after the accused or an accomplice commits a crime punishable by life or by 25 years. In that last category, the Crown does not have to prove any intent about the death at all. The Judicial Commission of NSW collects the case law on each element.

What is the maximum penalty for murder in NSW?

The maximum penalty for murder is imprisonment for life, under section 19A of the Act. A life sentence means the natural life of the offender, with no non-parole period, so a person given a life term is not released. Life is reserved for the worst cases, where the level of guilt is extreme and the community interest calls for the offender to be gaoled for the term of their life.

Where the court does not impose life, it works from a standard non-parole period. For a general murder committed on or after 1 February 2003 that figure is 20 years. It rises to 25 years where the victim was a child, or where the victim was a police officer, emergency services worker, correctional officer, judicial officer, health worker, teacher or other public official killed because of their occupation. Section 19B goes further and requires a life sentence for the murder of a police officer in certain circumstances. The standard non-parole period is a guidepost that a judge measures a case against, not a floor, as the High Court confirmed in Muldrock v The Queen [2011] HCA 39, on JADE. Because murder is a show cause offence, bail is hard to get, and our note on show cause bail explains why.

What is the sentence for manslaughter in NSW?

The maximum penalty for manslaughter is 25 years, under section 24 of the Act. There is no standard non-parole period and no mandatory minimum. That is deliberate. Manslaughter covers a huge span of conduct, from a killing that fell just short of murder to a death caused by a single reckless act. A sentencing judge has the full range open, and the sentence has to reflect where on that span the particular death sits.

In practice most manslaughter sentences are terms of full-time imprisonment, and serious cases attract long ones. But the absence of a fixed starting point means the offender's role, background and degree of fault carry real weight. The statutory sentencing factors in section 21A apply, along with the objective seriousness of the death. The Judicial Commission's sentencing material for manslaughter shows how wide the range runs.

When is a murder charge reduced to manslaughter?

A murder charge becomes manslaughter in two ways. The first is where the Crown simply cannot prove the fault element for murder, so the jury falls back to the lesser verdict. The second is where a partial defence applies. A partial defence accepts that the accused killed with a murderous state of mind, but says the law should treat the killing as manslaughter because of the circumstances.

NSW has three. Extreme provocation, under section 23, applies where the accused acted in response to conduct of the deceased that was a serious indictable offence and that could have caused an ordinary person to lose self-control to the point of intending to kill or inflict grievous bodily harm. The old, wider provocation defence was cut back to this narrow form in 2014. Substantial impairment, under section 23A, applies where the accused's capacity to understand events, to judge right from wrong, or to control themselves was substantially impaired by a mental health or cognitive impairment. That defence was renamed from "substantial impairment by abnormality of mind" in 2021. Excessive self-defence, under section 421, applies where the accused believed their conduct was necessary to defend themselves but the response was not reasonable in the circumstances. Where mental illness goes further and removes criminal responsibility altogether, a different path opens under the mental health provisions, which our note on the Mental Health and Cognitive Impairment Forensic Provisions Act covers.

What is the difference between voluntary and involuntary manslaughter?

Voluntary manslaughter is a killing that would have been murder but for a partial defence. The accused had the state of mind for murder, but provocation, substantial impairment or excessive self-defence brought the verdict down. Involuntary manslaughter is different. There was no intent to kill and no intent to cause grievous bodily harm at all, yet the killing is still a crime.

Involuntary manslaughter takes two forms. The first is manslaughter by an unlawful and dangerous act. The accused does an unlawful act that a reasonable person would recognise carried an appreciable risk of serious injury, and the act causes death. The leading authority is Wilson v The Queen (1992) 174 CLR 313, on JADE. The second is manslaughter by criminal negligence. The accused owed a duty of care, breached it, and the breach fell so far short of the standard of a reasonable person, and carried such a high risk of death or serious injury, that it deserves criminal punishment. The High Court confirmed that objective test in R v Lavender (2005) 222 CLR 67, on JADE. A death caused by grossly careless driving is often charged instead as dangerous driving causing death, which has its own section and its own penalties.

What is a one punch assault causing death?

A death from a single blow does not always fit murder or ordinary manslaughter, so NSW created a separate offence in 2014. Assault causing death, under section 25A of the Act, applies where a person hits another intentionally, the assault is unlawful, and it causes death. The Crown does not have to prove the death was foreseeable. The maximum is 20 years.

There is an aggravated form for an offender who was intoxicated at the time. That version carries a maximum of 25 years and a mandatory minimum sentence of eight years, one of the few mandatory minimums in the state. The offence was the response to a run of deaths outside licensed venues, and it sits alongside murder and manslaughter rather than replacing them. A serious assault that does not cause death is charged under the ordinary assault provisions instead, such as reckless wounding.

What defence work looks like in a homicide case.

The first questions are cause and intent. Did the act of the accused cause the death, or was there another cause the Crown has to rule out? And can the Crown prove the state of mind for murder, or does the evidence sit at manslaughter? Those two questions shape the whole case, because the gap between the verdicts is the gap between a possible life sentence and a finite one.

From there the work depends on the facts. It may be a complete defence, such as self-defence, that would lead to an acquittal. It may be a partial defence that reduces murder to manslaughter. It may be a plea to manslaughter where murder cannot be made out, followed by a careful sentencing case built on the offender's background, role and prospects. Homicide matters are run in the Supreme Court, and they turn on expert evidence, on the sequence of events, and on the reliability of the Crown case. They are the most serious charges a person can face, and the preparation has to match. Our guide to working with counsel explains how a solicitor and barrister run a serious trial together.

Frequently asked.

What is the difference between murder and manslaughter in NSW?

Both are unlawful killings under section 18 of the Crimes Act 1900. The difference is state of mind. Murder needs an intent to kill, an intent to cause grievous bodily harm, reckless indifference to human life, or a killing during a serious crime. Manslaughter is every other unlawful killing. Murder carries a maximum of life; manslaughter a maximum of 25 years.

What is the standard non-parole period for murder in NSW?

It is 20 years for a general murder committed on or after 1 February 2003, and 25 years where the victim was a child or was a police officer or other public official killed because of their occupation. The figure is a guidepost, not a floor, and it does not apply where the court imposes a life sentence.

What is the minimum sentence for manslaughter in NSW?

There is no standard non-parole period and no mandatory minimum for manslaughter. The maximum is 25 years. Because the offence covers such a wide range of conduct, sentences vary widely, and the outcome turns on how the death happened and the offender's degree of fault.

Can a murder charge be reduced to manslaughter?

Yes. It happens where the Crown cannot prove the fault element for murder, or where a partial defence applies. The partial defences in NSW are extreme provocation (section 23), substantial impairment because of a mental health or cognitive impairment (section 23A), and excessive self-defence (section 421). Each reduces murder to manslaughter rather than resulting in an acquittal.

What is involuntary manslaughter?

An unlawful killing without any intent to kill or to cause grievous bodily harm. It takes two forms: manslaughter by an unlawful and dangerous act, and manslaughter by criminal negligence, where the accused's breach of a duty of care fell so far short of the reasonable standard that it deserves criminal punishment.

Do murder and manslaughter charges start in the Local Court?

Yes. Both are strictly indictable, so they begin in the Local Court but are finalised in the Supreme Court before a judge and jury. Murder is a show cause offence, so bail is hard to get. In the ACT the same offences are in the Crimes Act 1900 (ACT) and are finalised in the ACT Supreme Court.

To speak to a criminal defence lawyer, call Aaron Kernaghan on 0421 717 019.

This article is written by Aaron Kernaghan, criminal defence lawyer at Good Legal Lawyers, as at 5 July 2026. It is commentary and reflects the personal opinion of the author only. It is not legal advice, it is not a substitute for advice on your own matter, and it does not purport to be accurate or complete. Any matter referred to may be before the court and any person charged is presumed innocent. For advice on a specific matter, contact Aaron Kernaghan on 0421 717 019 or contact the firm.

More criminal-law commentary by Aaron Kernaghan.

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