The main purposes of this Act are—
(a) to amend the Crimes Act 1958 —
(i) to remove provocation as a partial defence to murder; and
(ii) to create a new offence of defensive homicide and revise the offence of infanticide; and
(iii) to provide expressly for self-defence, duress, sudden or extraordinary emergency and the relevance of intoxication in relation to homicide offences; and
(b) to amend the Crimes (Mental Impairment and Unfitness to be Tried) Act 1997 to provide further for the defence of mental impairment.