¶ 1. Defendant Henry Butson, who pled nolo contendere in October 2004 to two second-degree murders, appeals from his plea and sentence. He contends that: (1) our decision in
State v. Provost,
¶ 2. In June 2003, defendant was charged with two counts of first-degree murder for causing the deaths of his former girlfriend (Karen) and his best friend (Melvin). Melvin and Karen started a relationship after Karen broke up with defendant. Before the killings, defendant had come to suspect that the two were having what he considered an illicit relationship. He felt that he had been betrayed, and in the spring of 2003 he began, essentially, to surveil the two. Defendant also told an acquaintance that he should have killed the two victims when he saw them together during turkey-hunting season in May 2003.
¶ 3. On June 1, 2003, defendant was going to a hunting camp where he and Melvin had spent time together over the years, when he came across Karen and Melvin, who were coming from the camp. He asked them how long they had been there, and they told him it had been about forty-five minutes. The three parted company, and defendant went to a neighboring camp to talk with an acquaintance. While there, he learned that Melvin and Karen had actually been at the camp for a couple of hours. Defendant became angry and told the neighbor that he would have shot Karen and Melvin if he had caught them in bed together.
¶ 4. At about 6:00 that evening, defendant drove to Melvin’s house and discovered that Karen was also there. Defendant confronted Melvin and Karen about their relationship, to which *192 they eventually admitted. Defendant became angry, told Karen that he still loved her, and said that he had trusted Melvin like a brother. Karen told Melvin to put defendant out of the house, and Melvin pushed him out the door. Defendant went to his truck, loaded his shotgun and pistol, and returned to the house with the weapons. Finding the front door locked, he shot a hole in the door and then shot the door handle off. He entered the home and chased Karen and Melvin to the bedroom, where he shot and killed them both. Defendant then fled into a remote wooded area, where he remained until he was apprehended some days later.
¶ 5. Defendant was charged with two counts of first-degree murder. 13 V.S.A. §2301. Prior to trial, defendant’s attorney advised the court several times that he and defendant were discussing or considering raising an insanity defense, and that he had retained the services of a psychiatrist to examine defendant and possibly testify for him. The State deposed defendant’s expert and engaged an expert of its own. Defendant never provided formal notice to the court that he would be pursuing an insanity defense, however. See V.R.Cr.P. 12.1(a).
¶ 6. In late August 2004, the State amended the information to charge defendant with aggravated murder. See 13 V.S.A. § 2311 (defining aggravated murder). At a status conference soon thereafter, the parties indicated to the court that they were discussing a possible plea bargain. At the same status conference, the court mentioned the then-recent decision of the United States Supreme Court in
Blakely v. Washington,
¶ 7. In early October 2004, the parties executed a plea agreement and filed it with the court. The State agreed to amend the charges to two counts of second-degree murder, 13 V.S.A. §§ 2301, 2303(b) (1998)
1
, and agreed that any sentences imposed would run concurrently. Defendant agreed to enter nolo contendere pleas to both charges. He also waived his right to have a jury decide whether aggravating factors justified an upward departure from the presumptive minimum sentence of twenty years, and acknowledged that the State could argue in favor of a maximum sentence
*193
up to life without parole. The agreement mandated that the State would have the burden of proving “to the sentencing Court’s satisfaction beyond a reasonable doubt the existence of any aggravating factors.” Defendant reserved the right to present evidence and argument in support of mitigating factors that might convince the court to impose a minimum sentence of as little as ten years. See
id.
The agreement was silent as to the burden of proof on the mitigating factors, but the parties and the court appear to have proceeded on the assumption that defendant bore the burden of showing the presence of mitigating factors by a preponderance of the evidence, rather than beyond a reasonable doubt. The plea agreement concluded by stating that defendant “agrees that this process serves to comport with the due process standards regarding pleading and notice as required by
Apprendi v. New Jersey,
¶ 8. Pursuant to the agreement, the State notified defendant that it would attempt to prove five aggravating factors: (1) the “victim of each murder was particularly weak, vulnerable and helpless in that they were unarmed, and trapped in a remote location”; (2) “[t]he murders were particularly severe, brutal or cruel” because defendant “shot his way into the home,” “broke his way into the room,” and wounded Karen and Melvin before killing them; (3) the murders involved multiple victims; (4) the murders were “predatory in nature”; (5) the murders were “deliberate and malicious.” See 13 V.S.A. § 2303(d). Defendant contested the aggravating factors and, as a mitigating factor, argued that “the facts support a finding that . . . defendant was suffering from a mental condition that significantly reduced his culpability.”
¶ 9. After a hearing, the judge found that the State had carried its burden of proof as to three of the five asserted aggravating factors: (1) there were multiple victims; (2)’ the victims were particularly weak, vulnerable, or helpless; and (3) the murders were particularly severe, brutal, or cruel. The court found, however, that the State had not met its burden as to the other two asserted aggravating factors: (1) that the murders were “predatory”; and (2) that the murders were considered, deliberate, and malicious.
¶ 10. Defendant proposed two mitigating factors at the hearing: first, that he had no prior criminal history; and second, that his mental state significantly reduced his culpability. The court found that the first was “established beyond a reasonable doubt.” The *194 court then found that the evidence was insufficient, under the preponderance standard, to show that defendant’s mental state was a formal mitigating factor. Next, the court balanced the three aggravating factors against the mitigating factor, concluded that the former substantially outweighed the latter, and sentenced defendant to a term of twenty-five years to life. As noted, the presumptive term for second-degree murder is twenty years to life. 13 V.S.A. § 2303(b). This appeal followed.
I. The Burden of Proof
¶ 11. Defendant’s first contention is that our decision in
State v. Provost,
¶ 12.
Provost
implemented the federal constitutional imperatives announced in
Apprendi v. New Jersey,
¶ 13. Accordingly, in
Provost
we held that Vermont’s murder-sentencing statute was unconstitutional because it allowed judges
*195
to impose sentences greater than the Blakely-defined statutory maximum based on judge-made findings.
Provost,
¶ 14. The Legislature responded in the next legislative session with comprehensive amendments to the sentencing statute. 2005, No. 119 (Adj. Sess.), § 2, eff. May 1, 2006 (amending 13 V.S.A. § 2303). Under the new statute, persons convicted of murders committed before May 1, 2006 have a right to have aggravating and mitigating factors found by a jury beyond a reasonable doubt before a sentence above the statutory maximum can be imposed. Id. As noted, defendant’s crime occurred in 2003, and he contends that he has a right to the procedures announced in the amended statute. 2 Under that statute, defendant argues, the judge’s finding — that defendant’s mental state did not significantly reduce his culpability — increased the penalty above the statutory maximum, and was therefore plain error because the judge did not find the absence of the mitigating factor beyond a reasonable doubt. We disagree.
¶ 15. Defendant did not object at trial to the judge making findings regarding his mental state’s impact on sentencing; indeed, defendant explicitly bargained for precisely the procedures employed, citing
Blakely
and attempting to take a “conservative” approach. Defendant benefited from this bargain by receiving in exchange the State’s agreement to prosecute him for second-
*196
rather than first-degree murder. Because defendant did not object at trial, our review is for plain error, which is error that we must recognize in order to avoid “a miscarriage of justice,” or error “so grave and serious that it strikes at the very heart of the defendant’s constitutional rights.”
State v. Brochu,
¶ 16. We cannot find plain error on the record before us. The parties, in close cooperation with the trial judge, attempted to forecast this Court’s response — which would come in
Provost
— to
Apprendi
and
Blakely,
both of which had been decided before the plea agreement was reached. As was noted at oral argument in this case, the plea agreement “predicted half of
Provost.”
That is, the parties correctly surmised that we would conclude that the then-operative murder-sentencing statute was unconstitutional because it allowed increased sentences based on judge-made findings of aggravating factors. See
Provost,
¶ 17. The question, in short, is whether the trial court’s decision to adopt a plea agreement that imperfectly predicted the outcome of a then-unknown future case in an unsettled area of the law was “a miscarriage of justice” or struck “at the very heart of the defendant’s constitutional rights.”
Brochu,
¶ 18. This case is closely akin to
State n King,
in which we concluded that a defendant who agreed to “have the trial court serve as finder of fact to determine the appropriate sentence . . . [had] waived his right to challenge the trial court’s sentencing procedure on appeal.”
II. The Insanity Defense
¶ 19. Defendant also argues that he did not waive the insanity defense, and that his plea must therefore be reversed under
State v. Brown,
¶ 20. Defendant had the right to decide personally whether to present an insanity defense.
State v. Bean,
¶21. As we noted in
Bean,
“notice of use of an insanity defense is essentially a plea of not guilty by reason of insanity.”
Bean,
¶22. Defendant’s citation of
Brown
does not persuade us that he did not effectively waive the insanity defense. In
Brown,
we
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concluded that a defendant who stipulated prior to trial that he would
permanently
waive his ability to raise mental capacity, either as an affirmative defense or as a factor in mitigation of sentence, did not effectively do so because the court conducted no colloquy at all.
Brown,
¶ 23. Defendant in this case is in a position closer to the defendant in
Davignon
than to the defendant in
Brown.
Here, defendant’s decision to present mental-state evidence only in support of a lesser sentence was a tactical one, apparently animated by his own belief that a jury would not be convinced by his insanity defense. Further, unlike the defendant in
Brown,
defendant here never formally raised the insanity defense, as required by our criminal rules. See V.R.Cr.P. 12.1(a). Thus, under the totality of the circumstances in this case, we find no error in the trial court’s treatment of defendant’s purported insanity defense. See
State v. Merrill,
III. Defendant’s Mental State and Culpability
¶ 24. Defendant next contends that the trial court abused its discretion in finding that his mental state did not significantly reduce his culpability. See
State v. Ingerson,
¶ 25. The court then noted that the principal dispute between the experts was whether, at the time of the crimes, defendant “was experiencing a dissociative disorder described by Dr. Helzer ... as a ‘fugue state,’ as a circumstance of detachment or removal from experience such that recollection and recall processing are impaired.” Dr. Drukteinis did not believe that defendant was in such a state at the time of the murders, noting that defendant retained detailed memories of the murders and wrote those memories down while he was hiding in the woods. Drukteinis further opined that the “fugue state” diagnosis was inconsistent with the fact that defendant had no significant mental-health history of any kind, much less of memory loss or dissociation. The court agreed with Dr. Drukteinis, finding that defendant had “a fairly detailed recollection of the events immediately leading up to the shootings,” as evidenced by a note he wrote after the shootings, which the court found “display[ed] a clear and rational mindset.” Based on these findings, the court found that defendant, although he was “in an emotionally distraught mental state,” did not suffer from a “dissociative disorder” (i.e., he was not in a “fugue state”), and that his culpability was therefore not significantly reduced.
¶26. This careful weighing of the competing testimony is plainly not an abuse of discretion. Defendant’s argument to the contrary is essentially an attack on the trial court’s decision to credit Dr. Drukteinis’ assessment, a decision that was squarely within the trial court’s discretion, and which we decline to disturb on the record before us.
Affirmed.
Notes
The sentencing statute was amended in 2006. See 2005, No. 119 (Adj. Sess.), § 2, eff. May 1, 2006. All citations in this opinion are to the pre-amendment statute, unless otherwise noted.
Subsection (g) of the amended statute does not mandate application of the new sentencing provisions to defendant, as his sentence was not “stricken and remanded for resentencing pursuant to [our] decision in
State v. Provost,
