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Assault, Sexual Assault, Homicide

7. Self Defence

Authors: Joanne Wilson
Firm / Chambers:
Last updated: 19 Jun 2015
    7. Self Defence
  • Self defence is a complete defence to criminal homicide.
  • Self defence can also be a complete defence to assault and serious injury offences.
  • A complete defence means that the person charged is not guilty and would suffer no criminal punishment as a result of the murder or assault.
  • However the force a person uses must be reasonable in the circumstances.
  • A person claiming self defence must be able to show the following:
    • they were unlawfully assaulted;
    • they did not provoke the assault;
    • the nature of the assault was such that the person reasonably feared that they would die or suffer a very serious injury;
    • they reasonably believed that they couldn’t save themselves from death or serious injury without using the force that they used; and
    • the force used was necessary.
  • For example a homeowner found an unarmed intruder in his home. He got out a gun and shot and killed the intruder. The homeowner would not be able to claim self defence as the force used was not reasonable or necessary in the circumstances.
  • In some circumstances excessive self defence can reduce a murder charge to manslaughter. This would depend on the circumstances of each case, including the actions of the deceased and the actions of the accused person. 

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