Accused or charged with manslaughter?

Manslaughter is a form of homicide where a person causes the death of another without the intention or recklessness required for murder. It is governed by section 13 of the Criminal Law Consolidation Act 1935 (SA). The offence applies when the death occurs due to an unlawful or negligent act but without intent to kill or cause grievous bodily harm.

The key difference lies in intent. Murder involves intent to kill, cause grievous bodily harm, or knowledge that death or serious injury would likely result. Manslaughter, on the other hand, applies where death was caused without intent, but due to criminal negligence, provocation, or an unlawful act such as an assault.

Voluntary manslaughter occurs when the accused intended to kill or cause serious harm, but partial defences like provocation or imperfect self-defence reduce the charge from murder. This category recognises that while intent was present, there were mitigating circumstances that lessen moral culpability.

Involuntary manslaughter applies when a death occurs due to:

• An unlawful and dangerous act (e.g., assault, drug injection)
• Criminal negligence showing gross disregard for life
  There is no intent to kill, but the conduct was still reckless or dangerous enough to be criminal.

Under section 13(1) of the Criminal Law Consolidation Act 1935 (SA), the maximum penalty for manslaughter is life imprisonment. However, the court has discretion to impose a lesser sentence, unlike the mandatory life sentence that applies to murder.

No. Although the maximum penalty is life imprisonment, it is not mandatory. The sentencing judge can consider mitigating factors and impose a lesser term of imprisonment or, in rare cases, a fine.

Yes. If a person’s use of a motor vehicle causes a death and amounts to criminal negligence or recklessness, they may be charged with manslaughter. If convicted, the court must disqualify the offender from holding a driver’s licence for at least 10 years under section 13(2).

The law recognises that in some cases people will not be capable of evaluating the nature and quality of their conduct or more categorically, they will not know what they are doing is wrong. If it can be shown that you were suffering from some sort of mental disease, disorder or disturbance, as distinguished from a mere lack of self-control or impulsiveness, then you may have a defence to this charge.

Mental impairments may be either permanent or non-permanent and may include disorders such as:

• Schizophrenia
• Hyperglycaemia
• Psychomotor epilepsy
• Cerebral arteriosclerosis

To prove involuntary manslaughter, the prosecution must show:

• You committed an unlawful act (e.g., assault);
• The act caused the death of another person;
• You should have known the act carried a real risk of serious injury.

Generally, no. A person cannot legally consent to serious harm or death. For example, injecting someone with drugs—even if they consented—can still result in manslaughter charges if death occurs (see R v Cato (1976)).

Defences may include:

• self-defence or defence of another
• provocation (voluntary manslaughter only)
• mental impairment
• involuntariness (e.g., automatism)
• it was not you who committed the act

Yes, but only as a partial defence. It can reduce murder to manslaughter, typically in circumstances where the accused lost control due to a provocative act by the victim. It does not apply to involuntary manslaughter.

Yes. If a single punch (even without intent to kill) results in death, and the act was unlawful and dangerous, this can lead to a conviction for involuntary manslaughter. Courts treat such incidents very seriously.

Only if the negligence is gross and shows a high disregard for human life. Simple inattention or carelessness is not enough. The negligent conduct must be a substantial factor in causing death (Andrews v DPP [1937]) and must exceed ordinary civil negligence.

Manslaughter is a major indictable offence. It begins in the Magistrates Court but is ultimately dealt with in the Supreme Court of South Australia. Legal representation is strongly recommended at every stage.

Yes. In some cases, a murder charge may be downgraded to manslaughter during plea negotiations if the defence presents valid partial defences (e.g., provocation, excessive self-defence). Similarly, the prosecution may accept a guilty plea to manslaughter when evidence for murder is uncertain.