OPINION
¶ 1 Thе issue in this case is whether a defendant’s statements during a plea colloquy relieve the State of its obligation under
Apprendi v. New
Jersey,
I.
¶2 The State charged Jonathan Wayne McMullen with the first degree murder of his mother and the attempted first degree murder of his father and brother. McMullen was fourteen years old when the events in question occurred. McMullen eventually agreed tо plead guilty to one count of reckless manslaughter in violation of Arizona Revised *227 Statutes (“A.R.S.”) § 13-1103(A)(1) (2001) in exchange for the dismissal of the murder and attempted murder charges.
¶ 3 Pursuant to Arizona Rules of Criminal Procedure 17.2,17.3, and 17.4(c), the superior court held a change-of-plea hearing to determine whether McMullen’s plea was knowing, voluntary, and intelligent. During that hearing, the court questioned McMullen about the factual basis for his guilty plea. McMullen stated that on the night of the shooting, he and a friend talked about taking his mother’s car and driving to Willcox. McMullen said that he was afraid that they might get caught taking the car and that he therefore decided to shoot the people at his house. McMullen then stated that he and the friend threw somеthing at McMullen’s mother’s bedroom door to waken her and, when she came into his bedroom, he shot her seven times. McMullen also stated that, when his brother and father came into the room, he shot his brother twice and his father once.
¶ 4 The superior court found that the plea was “knowingly, intelligently and voluntarily made,” but deferred acceptance of the plea until sentencing. The court also determined that under
Apprendi
and
Ring v. Arizona,
¶ 5 The State subsequently filed a notice of aggravating factors. 1 McMullen then filed a motion arguing that A.R.S. §§ 13-702 and 13-702.01 (2001) (the “aggravation statutes”) were unconstitutional. In a minute entry, the superior court held these statutes “unconstitutional on their face, and as applied to this case.”
¶ 6 The State filed a special action in the court of appeals, which accepted jurisdiction.
State v. Brown (McMullen) (“McMullen I
”),
¶ 7 McMullen then filed a petition for review in this Court. We granted review and held that the “statutory maximum” for purposes of
Apprendi
and
Blakely
is the presumptive sentence established for the defendant’s crime.
State v. Brown (McMullen) (“McMullen II”),
¶ 8 On remand, the superior court again held the aggravation statutes unconstitutional. The court also detеrmined that McMullen’s statements at his change-of-plea hearing were not “admissions of fact” for purposes of Apprendi and Blakely because McMullen had not “voluntarily relinquished his right to a jury trial on the facts necessary to aggravate his sentence.” The superior court further held that the existing aggravation statutes did not authorize the convening of a sentencing jury; instead, the сourt ordered a sentencing hearing at which *228 it would “be limited to sentencing the defendant to the presumptive five-year term.”
¶ 9 The State again filed a special action and the court of appeals again accepted jurisdiction.
State v. Brown (McMullen) (“McMullen III
”),
¶ 10 McMullen then filed a petitiоn for review in this Court, arguing that the aggravation statutes were unconstitutional and that the superior court lacked the power to convene a jury trial on the existence of aggravating factors. The State filed a cross-petition for review, arguing (1) that McMullen’s plea agreement waived his right to jury trial on the aggravating factors alleged by the State and (2) that McMullen’s statements during the plea colloquy were “admissions” not subject to the Sixth Amendment guarantee of jury trial. We denied McMullen’s petition for review and granted the State’s cross-petition. We have jurisdiction pursuant to Article 6, Section 5(3) of the Arizona Constitution and A.R.S. § 12-120.24 (2003).
II.
A.
¶ 11 McMullen first argues that the State is judicially estopped from contending that he waived any right tо a jury trial on aggravating factors by entering into the plea agreement. During a status conference after McMullen’s change-of-plea hearing, McMullen’s attorney stated that the defense was not “waivpng] a jury” for any aggravation/mitigation hearing. Later in the conference, the prosecutor agreed, stating that, at the change-of-plea hearing, McMullen
gave up his right to a jury trial with the charges pending before him. The plea the Court has taken on [sic] and the Plea Agreement predicates he knows he gave up a jury trial on that. And as far as the jury trial right [with respect to aggravating factors] that I do not believe exists in this matter, he hasn’t given that up. I think as a matter of law ... he is not entitled to a jury trial for аggravating/mitigating factors in this case.
The superior court subsequently held that McMullen had not waived any right to jury trial on aggravating factors.
¶ 12 In its first special action to the court of appeals, the State did not challenge the superior court’s ruling on waiver.
McMullen 1,
¶ 13 We do not quarrel with the reasoning of the court of appeals as to judicial estoppel. We do not, however, rely upon that doctrine in this case. “Judicial estoppel is not intended to protect individual litigants but is invoked to protect the integrity of the judicial process by preventing a litigant from using the courts to gain an unfair advantage.”
State v. Towery,
B.
¶ 14
Apprendi
and
Blakely
each involved defendants who entered guilty pleas to the crimes charged against them.
See Blakely,
¶ 15 The Court’s approach in
Apprendi
and
Blakely
was consistent with longstanding precedent. A defendant’s waiver of his Sixth Amendment rights must be knowing, voluntary, and intelligent.
See Boykin v. Alabama,
¶ 16 In this case, although McMullen’s plea agreement expressly waives any right to jury trial on the crime of reckless manslaughter, it is silent as to any waiver of the right to jury trial on aggravating factors. Nor was McMullen informed of such a right at the change — of-plea hearing. 3 A waiver of constitutionаl rights cannot be presumed on such a record.
¶ 17 Indeed, far from demonstrating waiver, the record makes plain that McMullen expressly preserved his jury trial claim. At the status conference, McMullen’s counsel explicitly told the superior court that his client was not waiving any such right. In response to that statement, the prosecutor candidly and correctly reсognized that no waiver had taken place.
¶ 18 We therefore hold that McMullen did not waive his right to jury trial on the aggravating factors alleged by the State through his agreement to plead guilty to reckless manslaughter. We turn to the next issue presented by the State’s cross-petition: whether a jury trial was not required because of McMullen’s “admissions” during the plea cоlloquy.
III.
¶ 19 In
Apprendi
the Supreme Court held that, under the Sixth and Fourteenth Amendments to the United States Constitution, “[o]ther than the fact of a prior conviction, any fact that increases the penalty for a crime beyond the prescribed statutory maximum must be submitted to a jury, and proved beyond a reasonable doubt.”
¶ 20 In
Blakely,
the Court applied its previous holdings to a Washington state defendant who pled guilty to second degree kidnapping involving domestic violence and use of a firearm.
A.
¶ 21 In the case before us, the State relies heavily on language in
Blakely
defining the “maximum sentence” for
Apprendi
purposes as the most severe sentence permitted by
“the facts reflected in the jury verdict or admitted by the defendant.” Id.
at 303,
¶ 22 The State concedes that neither
Blakely
nor any of the Supreme Court’s
Apprendi-ñne
of cases exрlain the context in which an “admission” by a defendant will satisfy the defendant’s Sixth Amendment right to jury trial. Like the case before us,
Blakely
involved a guilty plea rather than a jury verdict. Thus, the statement from
Blakely
upon which the State relies can reasonably be read as no more than a recognition that a fact necessary to allow the imposition of an
Apprendi
“maximum sentence”— thе “functional equivalent of an element” of the aggravated offense for which the defendant is being sentenced,
Apprendi,
¶ 23 This reading of
Blakely
is buttressed by the Sixth Amendment underpinnings of
Apprendi
and its progeny. Under the Sixth Amendment, a defendant who takes the stand аt trial and admits the existence of one or more of the elements of an offense does not thereby surrender his right to have the jury find all of the elements of the crime.
See United States v. Gaudin,
¶ 24 It is therefore clear that a defendant’s “admission” of an element of an offense during a judicial hearing does not affect his Sixth Amendment right to jury trial with respect to that element. Because an aggravating circumstance is the “functional equivalent of an element,”
Apprendi,
¶ 25 The State does not contend that McMullen’s guilty plea to reckless manslaughter necessarily admitted the existence of any оf the alleged aggravating factors. At most, McMullen made statements during the plea colloquy which may have been “admissions” in an evidentiary sense. But because McMullen did not agree to judicial factfinding and did not necessarily admit these facts by pleading guilty to an offense of which they were elements, his Sixth Amendment right to jury trial remains intact.
*231
¶26 In short, we hold that the Sixth Amendment right tо jury trial with respect to an aggravating factor necessary to impose a sentence remains inviolate unless the defendant’s plea of guilty necessarily establishes the aggravating factor (because the facts admitted are elements of an offense to which the defendant has pled guilty)
4
or the defendant has appropriately waivеd his right to jury trial with respect to these aggravating factors.
See Blakely,
B.
¶27 Our opinion today will likely have limited reach. The ease before us involves a guilty plea entered before the issuance of the
Blakely
opinion; we trust that few cases in which guilty pleas were accepted thereafter will be affected.
Blakely
makes plain that “nothing prevents a defendant from waiving his
Apprendi
rights” and that the State may condition a defendant’s guilty plea on his willingness to waive his right to a jury trial both on elements of the crime charged and on aggravating factors.
¶ 28 The practical scope of our ruling today is also effectively constrained by our recent opinion in
State v. Martinez,
holding that “once a jury implicitly or explicitly finds one aggravating factor, a defendant is exposed to a sentencing range that extends to the maximum punishment available under section 13-702.”
IV.
¶ 29 For the reasons stated above, we affirm the opinion of the court of appeals insofar as it holds that McMullen retains the right to jury trial with respect to the aggravating factors the State claims were “admitted” in the plea colloquy. We affirm the superior court’s similar holding and remand this case to the superior court for further proceedings consistent with this opinion.
Notes
. The State alleged four aggravating factors: (1) "Use, threatened use or possession of a deadly weapon or dangerous instrument during the commission of the crime," A.R.S. § 13 — 702(C)(2) (2001); (2) "[p]resence of an accomplice,” A.R.S. § 13-702(C)(4); (3) "[t]he physical, emotional and financiаl harm caused to the victim or, if the victim has died as a result of the conduct of the defendant, the emotional and financial harm caused to the victim’s immediate family,” A.R.S. § 13-702(C)(9); and (4) "Mying in wait for the victim or ambushing the victim during the commission of any felony,” A.R.S. § 13 — 702(C)(16).
. While
McMullen II
was pending in this Court, the superior court accepted the plea “in furtherance of the appeal.”
McMullen II,
209
Ariz.
at 201 ¶ 4 n. 2,
. This omission is hardly surprising, as the change of plea occurred before the issuance of the Supreme Court’s opinion in Blakely and our opinion in McMullen II, and the State took the position that there was no right to jury trial on aggravating factors.
. For example, if an adult defendant pleads guilty to child molestation under A.R.S. § 13-1410 (2001) (specifying as an element that the "child is under fifteen years of age”) and also pleads guilty to first degree murder of the child, the defendant has necessarily admitted the aggravating factor in A.R.S. § 13-703(F)(9) (Supp. 2005) because the victim must have been "under fifteen years of age.”
. This Court has held that judicial factfinding may be harmless error when no reasonable jury could have reached a determination contrary to that made by the judge.
State v. Ring,
