A murder-suicide pact arises when two or more people agree to die together, and one person carries out the act but survives. The survivor faces a murder charge. That is the legal reality, regardless of any agreement between the parties, and regardless of whether the deceased consented to die. Understanding how Australian courts treat these cases is essential if you or someone you know is caught up in one of the most legally complex situations in criminal law.
Why consent is not a defence to murder
Australian criminal law does not recognise consent as a defence to homicide. A person cannot validly agree to be killed in a way that excuses the killer. This principle is established firmly across every Australian jurisdiction. The victim's willingness, even their active encouragement, does not reduce a charge of murder to a lesser offence on its own.
That might seem harsh. But the rule reflects a consistent policy choice: the state does not permit individuals to authorise others to end their lives outside the narrow frameworks that govern voluntary assisted dying legislation. In NSW, the Voluntary Assisted Dying Act 2023 (NSW) provides the only lawful pathway to a medically assisted death, and it does not cover private agreements between individuals.
So a survivor of a pact stands in exactly the same position as any other person charged with murder. The prosecution must prove beyond reasonable doubt that the accused caused the death of another person, with intent to kill or cause grievous bodily harm.
Where mental impairment becomes central
Most pact cases that reach Australian courts involve defendants who raise a mental impairment defence, or who seek a finding that they were not mentally fit to stand trial. This is where the law gets complicated. A person who survived a suicide attempt alongside their partner may be profoundly affected by grief, trauma, and the underlying mental health conditions that gave rise to the pact in the first place.
Courts assess mental state at two distinct points. First, the question is whether the accused was mentally fit at the time of the offence to form the relevant intent. Second, if the matter proceeds, a court may consider whether the accused is currently fit to stand trial before the proceedings go further.
A defendant who suffered a serious psychiatric episode, or whose mental illness drove the agreement, may have a genuine defence under the mental impairment provisions of the relevant legislation. In NSW, that is governed by the Mental Health and Cognitive Impairment Forensic Provisions Act 2020. A successful mental impairment defence does not result in an acquittal in the conventional sense. It results in a special verdict, and typically a forensic patient order that places the person under supervision.
The manslaughter pathway
Where a full mental impairment defence is unavailable, a partial defence may reduce the charge from murder to manslaughter. Two partial defences are relevant in NSW.
The first is substantial impairment by abnormality of mind. If the accused's capacity to understand events, judge whether their actions were right or wrong, or control their conduct was substantially impaired by an underlying mental condition, the jury may return a verdict of manslaughter rather than murder. The impairment does not need to be total. It needs to be substantial.
The second is extreme provocation. This defence has narrowed considerably since its reform in NSW in 2014, and it no longer applies where the alleged provocation was a non-violent sexual advance. In pact cases it is rarely the right fit, but in some fact patterns involving long histories of domestic violence or coercion it has been argued.
Manslaughter itself still carries a maximum of 25 years in NSW. But it gives the sentencing judge far greater flexibility. A court can, in appropriate circumstances, impose a non-custodial sentence for manslaughter. Murder carries a standard non-parole period of 20 years and a mandatory life sentence for the worst category of case.
How courts have approached these facts
Australian courts have generally treated pact survivors with some degree of sympathy at sentencing, even when conviction is not avoided. Judges have taken into account the accused's psychological state, the consensual nature of the arrangement, the absence of any predatory motive, and the personal devastation the survivor carries.
That said, courts have also been clear that sympathy does not translate to leniency as a matter of right. Where the accused planned the act, secured equipment, or took steps over time, the sentencing exercise will reflect that deliberateness. A pact that unfolds in a single moment of shared despair sits very differently to one that was arranged over weeks.
In cases where the survivor was themselves seriously injured in the attempt, courts have sometimes taken a more restrained approach to sentence. The accused's own suffering is a relevant factor, though not a determinative one.
The role of specialist legal advice
No two pact cases look alike. The mental state evidence is almost always contested, often through competing psychiatric reports. The factual narrative matters enormously. So does the accused's personal history, the nature of the relationship, and whether any external pressure or coercion was present.
Ann Valos Criminal Law acts for people facing the most serious criminal charges, including murder and manslaughter matters involving complex mental health considerations. Engaging an accredited criminal law specialist at the earliest stage gives your legal team the best chance to gather the evidence, instruct the right experts, and build the strongest possible case before the matter is locked into a particular trajectory.
If you are facing a murder charge, or if someone you care about has been arrested following a pact situation, get specialist advice before saying anything to police. The first 24 hours often determine the shape of the entire case.
Key takeaways
- Consent from the deceased is not a defence to murder in any Australian jurisdiction.
- Mental impairment at the time of the offence is the most commonly argued defence in pact cases.
- A partial defence of substantial impairment by abnormality of mind can reduce murder to manslaughter.
- Fitness to stand trial is assessed separately from the mental state at the time of the offence.
- Sentencing courts consider the unique circumstances of pact cases, but there is no automatic leniency.
These cases sit at the intersection of criminal law and mental health law. Getting that intersection right requires a lawyer who understands both.