The category of manslaughter identified in R v Markby (1978) 140 CLR 108 is manslaughter by unlawful and dangerous act as described in Wilson v The Queen (1992) 174 CLR 313, not a separate or expanded category of involuntary manslaughter. Where a secondary party to a common enterprise claims the fatal act was outside the common design, the proper direction is that the applicant may be convicted of manslaughter by unlawful and dangerous act if the jury finds the applicant was party to an agreement encompassing the use of the weapon that caused death, but without intent to kill or cause really serious injury. Youth of an offender convicted of murder does not significantly reduce sentence where the offending involved planned serious criminal activity.
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