Consideration
75The Court may not take facts into account on sentence, in a way that is adverse to the interests of the Offender, unless those facts have been established beyond reasonable doubt. On the other hand, if there are matters which the Offender relies upon in mitigation of penalty, it is enough if those matters are proved by the offender on the balance of probabilities: The Queen v Olbrich [1999] HCA 54; 199 CLR 270 at [27]-[28].
76In the context of criminal responsibility cognitive deficits or mental illness may be relevant in one or more ways. Mental impairment may have a direct causal link to the relevant offending. It may have an indirect link. In some cases although there may have been an absence of a causal association, such impairment or mental illness may affect an offender's mental functioning at the time of the offence or in the lead-up to it.
77An offender's cognitive functioning is part of his or her subjective circumstances. It may reduce his or her moral culpability for the offence, it may reduce the role of general and/or specific deterrence in the sentencing exercise. It can in some cases render the term of imprisonment to be served more onerous.
78Whether mental illness or disorder does any or all of these things depends upon the nature and severity of the alleged mental condition. The point is that, provided it is factored into the sentencing exercise, it allows for the imposition of a sentence that is commensurate with both objective and subjective circumstances.
79It was not submitted by Mr Walsh, nor could it have been, that the Offender's mental health disorders were directly causative of the offence. Rather the submission was that those matters are to be taken into account in the assessment of the Offender's subjective case. In that context the submission was the Offender's mental disability or incapacity is an important factor to be considered: Written Submission for the Offender at [118] and [119].
80The medical evidence establishes that the Offender suffered from a number of interrelated psychiatric conditions that became increasingly problematic over a period of at least 6 years between 2004 and the date of the offence, 24 June 2010. These included an anxiety and depressive condition, an antisocial Personality Disorder, a substance abuse disorder and self-harm behaviours.
81The Offender had a history of periodic binge drinking related to his substance abuse disorder. Dr Miller noted that over a period of months in 2005 when she treated him she had attempted to decrease his alcohol consumption during the period of her treatment of him. In that regard she noted that he only binge drank on two occasions. Both of these occasions Dr Miller noted were reported to her at the time that each occurred. This history Dr Miller noted was confirmed by the Offender's mother's account.
82Accordingly, in the months preceding the offence the Offender had demonstrated an effort under specialist medical supervision, to do something about reducing his alcohol consumption. He was partly successful in doing so for a period. According to his account to Dr Roberts he finished work early on the day of the offence and said that he "let my guard down" and consumed a large quantity of various forms of alcohol during the afternoon and evening of the offence. His account in that regard is consistent with the evidence, in particular that of Dr Miller.
83As to the Offender's consumption of alcohol on the day of the offence, whilst it presents as a voluntary course of action, is to be seen in the context of his long-standing alcohol abuse disorder which in turn may be seen in context with the anxiety and depressive conditions for which he received treatment in the years preceding the offence. That said, he having previous knowledge of the effects that excessive alcohol could have on him, it cannot be said that he was free of responsibility for his level of intoxication in the lead-up to the callous and tragic attack upon the deceased.
84Dr Nielssen noted the prior history of the Offender's criminal offending behaviour in 2006 occurred whilst he was heavily intoxicated.
85Dr Nielssen in that same report noted that in relation to the offence, the subject of these proceedings, the Offender was affected by a moderate amount of alcohol at the time of the offence and that the Offender said that he could not recall it. Dr Nielssen, however, observed that he was able to drive his car to his grandmother's house and was also able to later find his way to a nearby hotel and back. The Crown submitted that this is relevant to the issue of whether the Offender had an intention to kill. His account of complete amnesia of the events, Dr Nielssen noted, was not consistent with a typical alcoholic blackout which would normally be associated with blood alcohol levels that are too high for many forms of purposeful behaviour. Dr Nielssen's analysis, accordingly, throws doubt on the Offender's account to a number of examining doctors as to having had a complete absence of memory in relation to the offence. This comment also applied to certain of his answers to police in the ERISP conducted on 29 June 2010.
86Although the Offender suffered from a significant level of psychiatric disability, Dr Nielssen concluded, like Dr Roberts, that he did not have a mental illness that would be considered in law to be a disease of the mind such as to provide him with a mental illness defence.
87The reports of the psychiatrists in this case do not establish a direct causal link between a particular diagnosed mental disorder in the Offender and the offence. Dr Roberts, however, did observe in his report of 11 July 2012 that he considered that there was evidence of "disordered brain function".
88I have concluded that the opinions expressed in the psychiatric reports as to the mental health issues concerning the Offender are to be taken into account as operating as relevant subjective matters in determining the sentence to be imposed.
89I have taken into consideration the question of motive in terms of financial advantage to the Offender in the commission of the crime. Whilst at least at some point during the evening of the offence, the offender determined upon using his grandmother's credit card, the evidence does not permit a conclusion, to the required standard, that he entered her home solely with that purpose in mind.
90I have also taken into account the Offender's age, namely, as earlier noted, 26 years. His age at the time of the offence and his level of maturity are matters also to be taken into account.
91In determining the sentence to be imposed specific deterrence is an important factor to be taken into account, as is the protection of the community from the Offender. I have considered both. Finally, I have also borne in mind the need for the promotion of the Offender's rehabilitation in determining sentence.