20 The offender's mental illness gives rise to potentially competing considerations in determining the appropriate sentence. On the one hand, it reduces his moral responsibility for the offence, which is a basis for imposing a shorter sentence. It is also a basis for placing relatively less weight on the considerations of deterrence: R v Engert (1995) 84 A Crim R 67. On the other hand, if his mental illness indicates that he is potentially dangerous to the community, that is a basis to impose a longer sentence, but not longer than that which would have been imposed if there were no mental abnormality: Veen v R (No.2) (1988) 164 CLR 465 at 472-3.
21 The task of assessing the measure of the offender's responsibility for the killing in the present case is a difficult one. As stated by the Court of Criminal Appeal in R v Blacklidge (30/11/1995 NSWCCA, unreported), he is to be sentenced on the basis that he is responsible for a deliberate act, which took the life of another person and which, but for the abnormality of mind, would bear the character of murder. Further, his reduced criminal responsibility on account of his mental illness is in part reflected in the reduced verdict.
22 In Blacklidge, Gleeson CJ said;
"It has long been recognised that the circumstances which may give rise to a conviction for manslaughter are so various, and the range of degrees of culpability is so wide, that it is not possible to point to any established sentencing tariff which can be applied to such cases. Of all crimes, manslaughter throws up the greatest variety of circumstances affecting culpability".
23 The Crown pointed to a number of factors which he submitted indicate that although the offender's capacity was impaired substantially, the impairment was not extreme. Subject to one matter, I think there is force in that submission. First, when the offender was questioned by police, he told an exculpatory story. That shows he was astute enough to the nature of his actions to seek to avoid responsibility for them.
24 Secondly, he was able to participate in a lengthy interview with police shortly after committing the offence and to give comprehending and responsive answers.
25 Thirdly, although there was evidence, accepted by the jury, that the offender was operating under a delusional belief that the deceased was going to come back with other people to attack the offender and his family, he was also acting in anger as a result of what his mother had been told by the prank callers. What he learned from them was false, but not a delusion in his mind. The unlikelihood that anyone would make up such an allegation appears to have prompted him to react, as any son would, with anger at what he thought the deceased had done to his mother.
26 In respect of the third matter, however, I am mindful of Dr Nielssen's evidence as to the impairment in reasoning and emotional control associated with early schizophrenia. The number and force of the stab wounds the offender inflicted on the deceased does demonstrate that the killing was fuelled by anger, for which the offender must bear a measure of responsibility, but is at the same time a clear indication that his capacity to control his actions was impaired to a very substantial degree.
27 Further, I accept, as submitted by Counsel for the offender, that there may be a level of artificiality in attempting to separate the state of mind of a person suffering from schizophrenia into delusional and non-delusional components.
28 The Crown did not invite me to make a finding that the offender represents a significant danger to the community so as to justify consideration of the protection of the community as a factor in determining sentence. Dr Nielssen's evidence in the trial suggested that the offender has responded well to anti-psychotic medication.
29 There was also a report prepared by a psychologist, John Taylor, which was tendered on behalf of the offender in the hearing on sentence. Dr Taylor was not cross-examined. He assessed the offender as having a low to moderate risk of recidivism. Dr Taylor's opinion was based on both actuarial analysis and clinical judgment. It was his opinion that the offender has reasonably good prospects for rehabilitation provided that his schizophrenic disorder can be successfully treated and managed and also providing that he is able to resolve substance abuse.
30 That evidence indicates that the offender does not represent a significant risk to the community so long as he receives appropriate supervision upon his release. His mental illness, his youth and the need for supervision are clearly special circumstances which justify some variation in the statutory proportion of the non-parole period to the total term of the sentence: see s 44(2) of the Crimes (Sentencing Procedure) Act 1999.
31 Both the Crown and Counsel for the offender referred me to a number of comparable sentencing decisions. The Crown referred to R v Connolly [2001] NSWSC 787; R v Bartlett [2001] NSWSC 685 and R v Lever [2001] NSWSC 1131. Counsel for the offender referred me to Regina v Mawson [2007] NSWSC 1473; R v Hucker [2002] NSWSC 1068; Regina v Mabbott [2002] NSWSC 502; R v Potts [2001] NSWSC 753 and Regina v Hawkins [2110] NSWSC 420. I have been assisted by those decisions. However, I am mindful of the remarks made by the Court of Criminal Appeal in R v Gagalowicz [2005] NSWCCA 452 at [47-52] and particularly the Court's conclusion that, from any review of sentences imposed in other cases of manslaughter, "inevitably the need arises to return to the facts and circumstances of the particular case and, whilst heeding its subjective features, to make an assessment of the gravity of its objective circumstances".
32 The objective circumstances in the present case were serious, but less so in my view than in the two cases referred to above which attracted the longest sentences, Lever and Gagalowicz.
33 At the sentence hearing, I received evidence of a victim impact statement prepared by the deceased's mother. Mrs Bannister attended every day of the trial but felt unable to cope with the sentence hearing and her statement was read by a representative of the Homicide Victim's Support Group. The Court acknowledges the important support that group provides to members of the community.
34 As noted by the Crown, a victim impact statement that deals with the effect of death on family members of the deceased is to be dealt with in accordance with the principles outlined by Hunt CJ at CL in R v Previtera (1997) 94 A Crim R 76 at 87. It cannot be relied upon to increase the sentence of an offender. However, Mrs Bannister's statement was a moving reminder of the tragedy brought into the life of a mother who loses a son. What was particularly moving, and heartening, was Mrs Bannister's acknowledgement that the offender has had a hard life, as did her son. That remark exhibits a measure of strength and good grace, which I hope will stand well for Mrs Bannister in her grief. The Court expresses its sympathy and understanding to Mrs Bannister and her family.
35 The offender is now 21 years old. He was 19 at the time of the offence. He was convicted of assaulting a police officer in the execution of his duty two months before this offence and was on a 2-year good behaviour bond at the time of the offence, which is to be taken into account as a matter of aggravation under s 21A of the Crimes (Sentencing Procedure) Act. That is the only offence of violence on his criminal record, which otherwise consists of minor driving offences. There was evidence in the trial suggesting that, before the present offence, the offender had taken some steps to get his life in order after that bond was imposed.
36 Although the offender indicated his intention to raise the partial defence of substantial impairment prior to the trial, there is no evidence that he offered a plea of guilty to the offence of manslaughter at any stage. Nonetheless, his trial was conducted efficiently and on the basis that he accepted responsibility for the killing. That is a factor which, whilst not demonstrating contrition, shows a willingness to facilitate the course of justice and is appropriately taken into account for the purpose of sentencing: see R v Doff [2005] NSWCCA 119 at [58].
37 Dr Taylor's report states that the offender was raised in what appears to have been a "very chaotic, dysfunctional and abusive family environment". Both his parents used illicit drugs and the family has been the object of a number of violent home invasions, perhaps as a result of that circumstance.
38 The offender is a young adult and I accept that he has reasonably good prospects of rehabilitation. I also accept that, with appropriate treatment and supervision, he does not appear to pose a significant risk to the community.
39 Taking into account the objective facts and all the subjective circumstances, and the principles to which I have referred, I have concluded that the following sentence should be imposed.