R v Turnbull (No 26)

In R v Turnbull, the defendant was convicted of the murder of an environmental officer and the attempted murder of a second officer. The case came before the Supreme Court of New South Wales, where the primary issue was the sentencing of the 79-year-old offender. The defendant had a history of investigations by the Office of Environment and Heritage for offences under the Native Vegetation Act 2003. He shot the first officer multiple times and detained the second officer for an extended period while he committed the murder. The jury rejected the partial defence of substantial impairment, finding that the offender's adjustment disorder did not constitute a serious mental disorder.

The court needed to determine the appropriate sentence considering the offender's age, health, and the objective seriousness of the crimes. The court held that the offences were of substantial objective gravity, given the multiple shots and wounds inflicted, and the fact that they were committed against public officials exercising their duties. The court emphasised the importance of general deterrence and the need for sentences to reflect the objective seriousness of the offences. Despite the offender's age and health, these factors did not mitigate the severity of the crimes. The court also noted the concurrent nature of the offences and their accumulation, which warranted a substantial aggregate sentence.

The court concluded that the appropriate sentence must adequately reflect the gravity of the offences and serve the purpose of general deterrence. It imposed a sentence of life imprisonment with a non-parole period of 20 years. The court found that the sentence was necessary to uphold the integrity of the criminal justice system and to ensure that the community's interests in deterrence and protection were served.