Cite as: 537 U. S. 101 (2003)
Opinion of O'Connor, J.
v. Arizona, 536 U. S. 584, 619-620 (2002) (O'Connor, J., dissenting). It remains my view that "Apprendi's rule that any fact that increases the maximum penalty must be treated as an element of the crime is not required by the Constitution, by history, or by our prior cases." Id., at 619.
I would resolve petitioner's double jeopardy claim on the sole ground that under Bullington v. Missouri, 451 U. S. 430 (1981), and its progeny a life sentence imposed by operation of law after a capital sentencing jury deadlocks and fails to reach a unanimous verdict is not an "acquittal on the merits" barring retrial. Because death penalty sentencing proceedings bear the hallmarks of a trial, we held in Arizona v. Rumsey, 467 U. S. 203, 211 (1984), that "an acquittal on the merits by the sole decisionmaker in the proceeding is final and bars retrial on the same charge." A defendant is "acquitted" of the death penalty for purposes of double jeopardy when the sentencer "decide[s] that the prosecution has not proved its case that the death penalty is appropriate." Poland v. Arizona, 476 U. S. 147, 155 (1986) (emphasis deleted and internal quotation marks omitted). In the absence of a death penalty acquittal, the "clean slate" rule recognized in North Carolina v. Pearce, 395 U. S. 711, 719-721 (1969), applies and no double jeopardy bar arises.
When, as in this case, the jury deadlocks in the penalty phase of a capital trial, it does not "decide" that the prosecution has failed to prove its case for the death penalty. Rather, the jury makes no decision at all. Petitioner's jury did not "agre[e] . . . that the prosecution ha[d] not proved its case." Bullington, supra, at 443 (emphasis added). It did not make any findings about the existence of the aggravating or mitigating circumstances. See Rumsey, supra, at 211 (where the trial judge "entered findings denying the existence of each of the seven statutory aggravating circumstances," the resulting "judgment, based on findings sufficient to establish legal entitlement to the life sentence, amounts to an acquittal on the merits and, as such, bars any
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