*770 OPINION
We first reviewed this matter on direct appeal from a judgment upon a jury verdict convicting appellant Victor Maximillian Jimenez of burglary, robbery with use of a deadly weapon, and two counts of first degree murder. Jimenez was sentenced to death, and this court affirmed all of his convictions but vacated the death sentence and remanded to the district court for a second penalty hearing before a newly empaneled jury.
See
Jimenez v. State,
*771 Facts
The facts surrounding the crimes committed by Jimenez are set forth in
Jimenez
v.
State
and need not be recounted here. Suffice it to say that although we perceived no prejudicial error in the guilt phase of the first trial, and therefore affirmed each of the convictions, it was clear that the jury found certain aggravating circumstances in the initial penalty hearing that could not be sustained on the facts. We therefore found it necessary to vacate the first death sentence and to remand the case for a new penalty hearing. In the earlier opinion, we concluded that the only “arguably sustainable aggravating circumstances presented to the jury were that Jimenez acted with ‘depravity of mind’ (NRS 200.033(8)) and that he committed the murders during a robbery (NRS 200.033(4)).”
Id.
at 343,
Discussion
A jury verdict will not be disturbed on appeal if supported by substantial evidence. Bolden v. State,
A. Prosecutorial Misconduct
Jimenez alleges that the prosecutor injected his personal opinion into the penalty hearing, and improperly referred to evidence not before the jury. He contends that as a result of this misconduct, the jury was influenced by prejudice, passion and other arbitrary factors. We disagree.
On a number of occasions, this court has declared the impropriety of prosecutors buttressing argument by force of their personal opinions. As we stated in Collier v. State,
Such an injection of personal beliefs into the argument detracts from the “unprejudiced, impartial, and nonpartisan” role that a prosecuting attorney assumes in the courtroom. . . . [B]y invoking the authority of his or her own supposedly greater experience and knowledge, a prosecutor invites undue jury reliance on the conclusions personally endorsed by the prosecuting attorney. . . . Prosecutors therefore must not express their personal beliefs, as was done here.
*772
Id.
at 480,
In the instant case, Jimenez complains that the prosecutor injected his own opinion concerning gradations of first degree murder and the differing degrees of punishment that each may justify. The prosecutor’s argument was not improper. We have previously recognized the right of a prosecutor in a penalty phase hearing to discuss “general theories of penology, such as the merits of punishment, deterrence and the death penalty.” Ybarra v. State,
Jimenez also contends that the prosecutor improperly referred to evidence outside the record. Usually, counsel’s references in argument to evidence not properly before the jury is improper.
Ybarra,
Both prosecutors and defense counsel “share a duty to confine arguments to the jury within proper bounds.” United States v. Young,
Based upon our review of the record, we are not persuaded that the conduct complained of by Jimenez was either improper or unfair. To the contrary, it appears that the prosecutor argued persuasively but not inappropriately.
B. Aggravating and Mitigating Factors
As noted above, our original opinion stated that “[t]he only arguably sustainable aggravating circumstances presented to the jury were that Jimenez acted with ‘depravity of mind’ and that he committed the murders during a robbery.”
Jimenez,
The State offered two additional aggravating circumstances to the jury: torture and mutilation. We have held that the aggravating circumstance specified at NRS 200.033(8) requires “torture,
*774
mutilation or other serious and depraved physical abuse beyond the act of killing itself, as a qualifying requirement to an aggravating circumstance based in part upon depravity of mind.” Robins v. State,
In this case, the jury’s separation of torture and mutilation into two separate aggravating circumstances does not constitute a basis for reversal. In the first place, because the jury had a sufficient evidentiary foundation for finding that the victims were tortured and mutilated in the course of the murders, we need only view the jury’s findings as justification for one aggravating circumstance. Second, Jimenez murdered two victims while robbing Gabe’s Bar, clearly an aggravating circumstance under NRS 200.033(4). Because the jury discerned “no mitigating circumstances sufficient to outweigh the aggravating circumstance or circumstances found,” the death sentence will be affirmed.
We have considered Jimenez’ other assignments of error and conclude that they are without merit.
Based upon our review of the record, we are persuaded that the sentence of death was not the result of passion, prejudice or any arbitrary factor, and that the sentence was not excessive, considering both the crime and the individual characteristics and background of the defendant. Having determined that this, the second *775 penalty hearing accorded Jimenez, was free of prejudicial error, we affirm the judgment upon the jury verdict sentencing Jimenez to death.
