Justice PATTERSON delivered the opinion of the Court.
During the trial of defendant Michael Ross II for two counts of first-degree murder, two weapons offenses and hindering apprehension, the jury twice interrupted its deliberations to communicate with the trial court. On the fifth day of deliberations, the jury advised the court that it was “unable to reach a unanimous decision on any count” of defendant’s indictment, and sought instruction from the court. The trial court directed the jury to resume deliberating, with a view to reaching an agreement, if such agreement could be achieved without impairing the judgment of individual jurors. The jury complied, but later that day communicated with the court to report that one of the jurors had become ill. After dismissing the jury for the day and speaking with the ailing juror the following morning, the trial court excused her from further service. Without objection from the State or defendant, the court substituted an alternate juror for the excused juror. The reconstituted jury, instructed to initiate new deliberations with the full participation of the substituted juror, deliberated for more than sixteen hours and convicted defendant of all charges. Defendant appealed, and an Appellate Division panel reversed, holding that the trial court’s decision to substitute an alternate for the ailing juror constituted plain error.
We hold that in the circumstances of this case, the trial court properly addressed both of the issues raised by the jury in the course of its deliberations. The trial court’s instruction to the jury to continue deliberations, notwithstanding its initial report of a deadlock, conformed to this Court’s decision in State v. Czachor, 82 N.J. 392, 404-06, 413 A.2d 593 (1980). Confronted with a [137]*137report that a juror was unable to continue because she was ill, the trial court verified that the juror’s inability to continue was prompted by her condition, rather than a dispute among the jurors. The trial court then substituted an alternate in accordance with Rule 1:8 — 2(d)(1) and properly instructed the reconstituted jury to commence new deliberations. In its response to both developments, the trial court preserved the confidentiality and integrity of the jury’s deliberations and protected defendant’s right to a fair trial.
Accordingly, we reverse the judgment of the Appellate Division, and remand to the Appellate Division for consideration of the remaining issues that the panel did not reach in light of its resolution of the jury substitution issue.
I.
On October 30, 2003, Alesky Bautin and Sergey Barbashov were shot and killed while sitting in Barbashov’s parked vehicle in front of an apartment complex in Avenel. More than three years later, defendant was indicted for two counts of first-degree murder, N.J.S.A. 2C:11 — 3(a)(l),(2); second-degree possession of a weapon for an unlawful purpose, N.J.S.A. 2C:39-4(a); third-degree unlawful possession of a weapon, N.J.S.A. 2C:39 — 5(b); and third-degree hindering apprehension or prosecution, N.J.S.A. 2C:29 — 3(b)(1).
Defendant’s trial commenced on April 1, 2008, and continued for eight trial days. The State’s theory of the case was that defendant shot the victims after mistaking one of them for a man who had pointed a gun at him from a ear similar to the victims’ vehicle. In the course of the trial, the jury heard the testimony of twenty witnesses, including three expert witnesses called to opine as to the cause of the victims’ deaths. The prosecution and defense introduced into evidence more than one hundred exhibits. Defendant testified on his own behalf, denying any involvement in the murders. During summation, defense counsel suggested that two of defendant’s acquaintances, not defendant, were responsible for the shooting.
[138]*138The trial court charged the jury on April 16, 2008. At the close of the charge, the trial court advised the jurors that they could pose questions or communicate with the court by writing a note and handing it to a court officer. The trial judge promised to respond to any questions posed as quickly as possible, and admonished the jurors to avoid disclosing the status of their deliberations to the court and counsel in the event that they decided to ask a question. The court then randomly selected three jurors to serve as alternates.
The jury deliberations commenced during the afternoon of April 16, 2008, and continued that day for less than an hour. The jury then deliberated for more than four hours on April 17, 2008, and for a similar period on April 18, 2008. During the first three days of deliberation, the jury posed procedural questions to the trial judge and requested readbacks of the testimony of two witnesses. The jury deliberated for more than five hours on the fourth day, April 21, 2008. Late that day, the jurors sought clarification “in layman’s terms” of the meaning of reasonable doubt. They were told by the trial court that they would be charged on that subject the following day, and that they should suspend deliberations for the evening. The jury was excused at 3:42 p.m.
The following day, after being charged with respect to reasonable doubt, the jury sent to the trial court a note stating: “The jury was unable to reach a unanimous decision on any count. What is your next instruction?” With no objection from either counsel, the trial court read to the jury the Model Criminal Jury Charge based on Czachor, supra, 82 N.J. 392, 413 A.2d 593 (the Czachor charge). See Model Jury Charge (Criminal), “Judge’s Instructions on Further Jury Deliberations” (Jan. 14, 2013). The trial court instructed the jury:
So, ladies and gentlemen, it’s your duty as jurors to consult with one another and to deliberate with a view to reaching an agreement, if you can do so without violence to individual judgment. Each of you must decide the ease for yourself, but you do so only after an impartial consideration of the evidence with your fellow jurors. In the course of your deliberations, do not hesitate to reexamine your own views, change your opinion, if convinced it’s erroneous. But do not surrender your honest conviction as to the weight or effect of evidence solely because of the [139]*139opinion of your fellow jurors or for the mere purpose of returning a verdict. You are not partisans. You are judges, judges of the facts.
After receiving the Czachor charge and taking a lunch break, the jury deliberated for about two and one-half hours. The trial judge then received a note from the jury stating: “Juror No. 5 is sick and does not expect to be here tomorrow. Thank you.” In the presence of counsel, the trial court questioned Juror No. 5 about her condition. Juror No. 5 stated that she had “a terrible headache,” and that her “stomach [was] nauseous.” The trial judge told the juror “to go home” for the day and to call the court in the morning if she was “not feeling up to” coming in.
The following day, April 23, 2008, Juror No. 5 called the trial judge’s chambers and advised the judge’s assistant that she was “still ill” and that she could not return to court. With counsel present, the trial judge contacted the juror by telephone. The juror confirmed on the record that she had advised the judge’s assistant that she remained ill. She stated that she had a “[h]eadache and sore throat and nauseous stomach,” and that she “wouldn’t be able to make it” to court that day. After verifying that neither counsel had questions for the juror, the judge excused her from further participation in the trial, admonished her not to discuss the case while it remained pending, and thanked her for her service.
The trial court then confirmed on the record a prior discussion in which the court and counsel “agreed that [the court was] going to substitute a new juror.” The court noted that although the jury had deliberated for more than four days, there was no indication that it had “made any actual fact findings or reached any determinations of guilt or innocence,” or that it had rendered a partial verdict. The court concluded that there was “nothing that would indicate that a new juror [would] not play a meaningful role in deliberations.” It recounted the communications received from the jury the previous day, and asked counsel to confirm their positions regarding the replacement of the juror on the record.
[140]*140The prosecutor noted her agreement with the court’s decision. Defense counsel stated that he had no objection. He noted “that had the jury come back” after being charged to resume deliberations, and stated that it could not reach a unanimous verdict, “then we’d be talking [about] a different scenario.” Defense counsel commented that since there was only one note from the jury indicating its inability to reach a verdict, followed by the trial court’s Czachor instruction and the report of the juror’s illness, “I don’t think there’s any credible way to even form an objection, if I had one.”
The court clerk then randomly selected one of the three alternate jurors to serve as a substitute juror. In accordance with the Model Criminal Jury Charge, the trial court advised the jurors that “as of this moment, you are now a new jury.” It instructed them to set aside any statements made in deliberations prior to the departure of the excused juror and to disregard any opinions expressed by that juror. The court admonished the jury to “consider all evidence presented at trial as part of your full and complete deliberations until you reach your verdict.” See Model Jury Charge (Criminal), “Judge’s Instructions When Alternate Juror Empaneled After Deliberations Have Begun” (Jan. 14, 2013).
The reconstituted jury commenced its deliberations on April 23, 2008, after receiving the trial court’s instructions. It met for five hours before being excused for the day. The jury deliberated for four and one-half hours on April 24, 2008, and requested a readback of testimony different from the testimony that the original jury had requested during its deliberations. The jury deliberated for five and one-half hours on April 25, 2008. On April 29, 2008, the fourth day of its deliberations, the jury met for about two hours before announcing that it had reached a verdict. In total, the reconstituted jury deliberated for more than sixteen hours before arriving at a verdict. The jury convicted defendant of all charges pending against him.
[141]*141More than three months after the verdict, in an untimely motion for a new trial, defendant objected for the first time to the substitution of the juror. Rule 3:20-1; Rule 3:20-2. Defense counsel conceded that the trial court and counsel had done an “excellent job” of crafting a solution following the juror’s illness. He also acknowledged that the reconstituted jury was “particularly good,” as it was observed discarding papers that had been posted in the jury room during the original jury’s pre-substitution discussions, consistent with the court’s instruction to begin deliberations anew. He argued, however, that the Appellate Division opinion in State v. Banks, 395 N.J.Super. 205, 928 A.2d 842 (App.Div.), certif. denied, 192 N.J. 598, 934 A.2d 639 (2007), barred the substitution of a juror in the circumstances of this case, and compelled the trial court to declare a mistrial. The trial court denied the motion for a new trial, distinguishing Banks on the ground that the juror in that case was removed for personal bias, not due to an illness.
The trial court merged defendant’s weapons convictions into his murder convictions, and sentenced him to a term of life imprisonment subject to an eighty-five percent parole ineligibility period under the No Early Release Act, N.J.S.A. 2C:43-7.2, on each of the two first-degree murder convictions, with the two terms to run consecutively. It also sentenced defendant to a five-year term of incarceration, to run consecutively to defendant’s two terms of life imprisonment, on the hindering apprehension charge.
An Appellate Division panel reversed defendant’s conviction and remanded for a new trial. It held that the trial court’s “post-deadlock substitution” of a juror constituted plain error. The panel construed the original jury’s declaration that it could not reach a verdict to strongly suggest that some jurors had made up their minds about the case, and were thus incapable of starting deliberations anew. The Appellate Division panel expressed doubt that the alternate juror could fully participate in the deliberations of the reconstituted jury given the original jury’s progress to the point of declaring a deadlock.
[142]*142The State filed a petition for certification, and the Appellate Division stayed its judgment pending the determination of the State’s petition. We granted certification. 214 N.J. 118, 67 A.3d 1192 (2013).
II.
The State challenges the Appellate Division’s conclusion that the trial court committed plain error. It contends that the trial judge properly substituted an alternate juror for the juror whose illness prevented her continued involvement in the case. It argues that there is no per se rule setting a point in time, during the deliberations of an original jury, after which a trial court may not substitute an alternate juror for a departing juror and then direct the reconstituted jury to begin its deliberations anew. The State contends that in this case, the original jury deliberated for a reasonable amount of time in light of the length and complexity of the trial. Further, it argues that the reconstituted jury’s protracted discussions following the substitution of an alternate for an ill juror confirm that it properly conducted new deliberations leading to the verdict.
Relying on the Appellate Division’s decision in Banks, supra, 395 N.J.Super. 205, 928 A.2d 842, defendant argues that the Appellate Division properly found plain error in the trial court’s substitution of an alternate for the ill juror in this case, and that no juror substitution should take place following a declaration of an impasse and an instruction to the jury to resume deliberations. Defendant urges the Court to rule that a trial court should rarely substitute a juror for any reason after a case goes to the jury. He maintains that the longer the original jury has discussed the case, the less likely it is that a reconstituted jury will be in a position to commence fair and open-minded deliberations. Defendant requests that the Court affirm the Appellate Division’s judgment.
III.
Since defendant failed to object to the trial court’s decision to substitute an alternate for an ill juror, we review the trial court’s [143]*143decision under the standard of plain error. In the interests of justice, an appellate court may “notice plain error not brought to the attention of the trial or appellate court.” R. 2:10-2. Plain error is “[a]ny error or omission [that] ... is of such a nature as to have been clearly capable of producing an unjust result.” R. 2:10-2.
In this case, we measure against the plain error standard the trial court’s sequential responses to two developments in the course of jury deliberations: (1) the court’s decision to give an instruction pursuant to Czachor, supra, 82 N.J. at 404-06, 413 A.2d 593, rather than declaring a mistrial, in the wake of the jury’s announcement of a deadlock; and (2) its substitution of an alternate juror for a juror who became ill, followed by an instruction to the reconstituted jury to deliberate anew. We consider these issues in turn.
A.
In Czachor, this Court provided guidance to trial courts confronted with a jury’s declaration that its deliberations have progressed to an impasse. Ibid. The Court found plain error in a trial court’s repeated charge to a deadlocked jury in accordance with Allen v. United States, 164 U.S. 492, 17 S.Ct. 154, 41 L.Ed. 528 (1896), which it had previously upheld in State v. Bland Williams, 39 N.J. 471, 484-85, 189 A.2d 193, cert. denied, 374 U.S. 855, 83 S.Ct. 1924, 10 L.Ed.2d 1075 (1963). Id. at 402, 404, 413 A.2d 593. The Allen charge directed jurors to “ ‘listen, with a disposition to be convinced, to each other’s arguments,’ ” and admonished a dissenting juror to “‘consider whether his doubt was a reasonable one ... [and] whether [the juror] might not reasonably doubt the correctness of a judgment which was not concurred in by the majority.’” Id. at 395-96, 413 A.2d 593 (alternations in original) (quoting Allen, supra, 164 U.S. at 501, 17 S.Ct. at 157, 41 L.Ed. at 531). This Court considered the Allen charge to have “coercive effects upon jury deliberations,” and disapproved both its application and the New Jersey Model Crimi[144]*144nal Jury Charge on this issue then in use in state court criminal trials. Id. at 394, 404-05, 413 A.2d 593. In its stead, this Court adopted the model charge suggested by the American Bar Association (ABA). Id. at 405-06, 413 A.2d 593 (citing ABA Project on Minimum Standards for Criminal Justice, Standards Relating to Trial by Jury, § 5.4, at 145-46 (Approved Draft 1968)).1
Accordingly, New Jersey’s Model Criminal Jury Charges now include the Czachor charge, to be given to a jury that has announced a deadlock. That charge admonishes jurors to “deliberate with a view to reaching an agreement,” to independently decide the case “after an impartial consideration of the evidence with fellow jurors” and to re-examine and change individual views if they are erroneous; it also counsels them to avoid surrendering an honest conviction simply to conform to other jurors’ opinions or to render a verdict. Model Jury Charge (Criminal), “Judge’s Instructions on Further Jury Deliberations” (Jan. 14, 2013).2
The trial court’s determination as to whether a Czachor charge is warranted requires a careful analysis of the circumstances. When a jury communicates a deadlock, trial courts “should be guided in the exercise of sound discretion by such factors as the length and complexity of trial and the quality and duration of the jury’s deliberations.” Czachor, supra, 82 N.J. at 407, 413 A.2d 593. Consistent with the principle that a jury verdict must not be the product of coercion, appellate review of a trial court’s supplemental instruction is “guided by a concern for the weighty role that the judge plays in the dynamics of the courtroom.” State v. Figueroa, 190 N.J. 219, 238, 919 A.2d 826 [145]*145(2007) (citing State v. Tyler, 176 N.J. 171, 181, 821 A.2d 1139 (2003)). The trial judge’s discretion must be exercised in a manner that ensures “ ‘a jury verdict free from untoward interference from any source, including the court.’ ” State v. Shomo, 129 N.J. 248, 257, 609 A.2d 394 (1992) (quoting State v. Collier, 90 N.J. 117, 122, 447 A.2d 168 (1982)); see also State v. Corsaro, 107 N.J. 339, 346, 526 A.2d 1046 (1987) (cautioning that “the deliberative process ... must be insulated from influences that could warp or undermine the jury’s deliberations and its ultimate determination”). When the “ ‘difference of opinion between members of the jury is clearly intractable,’ ... then the jury is deadlocked and a mistrial should be declared.” Figueroa, supra, 190 N.J. at 237, 919 A.2d 826 (quoting State v. Valenzuela, 136 N.J. 458, 469, 643 A.2d 582 (1994)).3
Confronted by the jury’s statement that it had been unable to reach a unanimous verdict on any count, and responding to its request for direction in light of that development, the trial court properly applied the principles articulated by this Court in Czachor. The jury in this case did not signal an intractable divide that would warrant a declaration of mistrial. Instead, it communicated that its effort to reach consensus on the issues had fallen short. The trial court properly refrained from any inquiry that could have compromised the confidentiality of the jury’s deliberations, and instructed the jury to resume deliberations in accordance with the approved Czachor charge. As both parties agree, the trial court properly exercised its discretion in response to the jury’s communication of an impasse by providing a Czachor charge and directing the jury to resume deliberations.
[146]*146B.
Shortly after the original jury reconvened, a juror’s illness precluded her from continued participation in this case, posing a second challenge to the trial court. The trial court’s decision to substitute an alternate juror for the ill juror gave rise to the issue at the center of this appeal.
Rule 1:8 — 2(d)(1) sets forth the procedure for the substitution of an alternate juror for a juror who “dies or is discharged by the court because of illness or other inability to continue.” If the trial court elects to replace an excused juror, rather than to declare a mistrial, the court directs the clerk to draw the name of the alternate who will deliberate. R. 1:8 — 2(d)(1). It “instruet[s] the jury to recommence deliberations,” and gives any other “supplemental instructions as may be appropriate.” R. l:8-2(d)(l). The newly composed jury then begins its deliberations.
Rule 1:8 — 2(d)(1) “delicately balances two important goals: judicial economy and the right to a fair jury trial.” State v. Jenkins, 182 N.J. 112, 124, 861 A.2d 827 (2004) (citing State v. Phillips, 322 N.J.Super. 429, 436, 731 A.2d 101 (App.Div.1999)). As this Court has observed,
[declaring a mistrial imposes enormous costs on our judicial system, from the expenditure of precious resources in a retrial to the continued disruption in the lives of witnesses and parties seeking closure. Any court that has presided over days or weeks of testimony must experience a sense of futility at the prospect of aborting a trial in the jury deliberation stage.
[Id. at 124, 861 A.2d 827.]
The juror substitution procedure set forth in Rule 1:8-2(d)(1) has been held not to “offend our constitutional guaranty of trial by jury.” State v. Miller, 76 N.J. 392, 406, 388 A.2d 218 (1978); see also State v. Joel Williams, 171 N.J. 151, 162, 793 A.2d 594 (2002) (stating that substitution of juror in course of deliberations “does not in and of itself offend a defendant’s constitutional guarantee of a trial by jury”). Such a substitution, however, contravenes constitutional norms if it impairs the mutuality of deliberations — the “joint or collective exchange of views among [147]*147individual jurors.” Joel Williams, supra, 171 N.J. at 163, 793 A.2d 594; see also State v. Hightower, 146 N.J. 239, 253, 680 A.2d 649 (1996). The trial court is charged with maintaining “an environment that fosters and preserves that exchange until the jury reaches a final determination.” Joel Williams, supra, 171 N.J. at 163, 793 A.2d 594 (citing Corsaro, supra, 107 N.J. at 349, 526 A.2d 1046). The court must be prepared to declare a mistrial if a substitution would imperil the integrity of the jury’s process. Hightower, supra, 146 N.J. at 253-54, 680 A.2d 649. The trial judge’s task is complicated by the need to diligently protect the confidentiality of jury communications as he or she inquires about the status of the juror in question. In short, the trial court must appraise the impact of a juror substitution on the jury process, without tainting that process with intrusive questions. It must conduct any inquiry with respect to the juror in question, or the jury as a whole, with caution and restraint.
Given the competing interests at stake, this Court has directed trial courts to focus on two related issues. First, the trial court must determine the cause of the juror’s concern and assess the impact of the juror’s departure on the deliberative process. Second, in light of the timing of the juror’s dismissal and other relevant considerations, the trial court must ascertain whether a reconstituted jury will be in a position to conduct open-minded and fair deliberations.
In evaluating the cause of a juror’s departure, our courts distinguish between reasons that are personal to the juror, which may permit a substitution under Rule 1:8 — 2(d)(1), and issues derived from “the juror’s interaction with the other jurors or with the case itself,” which may not. Joel Williams, supra, 171 N.J. at 163, 793 A.2d 594 (citing Valenzuela, supra, 136 N.J. at 468, 643 A.2d 582). Consistent with the language of Rule l:8-2(d)(l), and in the absence of indicia that a reconstituted jury cannot engage in meaningful deliberations, our courts have consistently upheld the substitution of an alternate for a juror excused for personal reasons unrelated to the case. A physical illness is recognized in [148]*148the text of Rule 1:8 — 2(d)(1) to constitute a basis for removal and replacement of a juror. See R. 1:8 — 2(d)(1); Jenkins, supra, 182 N.J. at 130, 861 A.2d 827 (observing that “[a] juror suffering from a purely personal problem, like a physical illness, could be removed and replaced by an alternate without fear that the ultimate verdict’s validity has been compromised”).
This Court has also considered a juror’s psychological condition as a reason that he or she cannot continue to serve. The “inability to continue” language of Rule 1:8 — 2(d)(1) “has been invoked to remove a juror under circumstances that reveal the juror’s emotional condition renders him or her unable to render a fair verdict.” Joel Williams, supra, 171 N.J. at 164, 793 A.2d 594 (citing Hightower, supra, 146 N.J. at 255, 680 A.2d 649); see also Miller, supra, 76 N.J. at 406-07, 388 A.2d 218 (holding that trial court properly substituted an alternate for juror who “stated that in his then nervous and emotional condition, he did not think he could render a fair verdict”); State v. Trent, 157 N.J.Super. 231, 235-36, 240, 384 A.2d 888 (App.Div.1978), rev’d on other grounds, 79 N.J. 251, 398 A.2d 1271 (1979) (authorizing replacement of juror who cited her “nervous” and “emotional” condition, manifested in headaches and nausea, because defendant reminded her of her son). This Court has also held that the “inability to continue” standard of Rule l:8-2(d)(l) authorizes the substitution of an alternate for a juror who seeks to be excused because of the financial hardship imposed by continued service. Joel Williams, supra, 171 N.J. at 167, 793 A.2d 594.
These personal concerns prompting a juror’s departure in the midst of deliberations — a physical illness, an emotional condition or the financial burden of service — do not originate in the interactions between the excused juror and the remaining jurors. Accordingly, they do not preclude the substitution of an alternate for the excused juror. See R. 1:8 — 2(d)(1).
In contrast, this Court’s decision in Valenzuela, supra, involved the dismissal of a juror whose relationships with other jurors deteriorated in the course of deliberations. 136 N.J. at 462-66, [149]*149643 A.2d 582. There, the trial court received a note stating that a juror did not want to continue her service. Id. at 462, 643 A.2d 582. The juror represented that the other jurors were “ganging up” on her, that they were discounting her opinions, and that they considered her an obstacle to a verdict. Id. at 462-65, 643 A.2d 582. This Court held that because the juror’s inability to complete her service “related not only to personal circumstances but also to factors arising from the juror’s interactions with the other jurors,” her discharge from further service was an abuse of discretion. Id. at 473, 643 A.2d 582.
In addition to determining whether issues personal to the juror or troubled relationships in the jury room have prompted the juror’s departure, the trial court should consider whether a reconstituted jury will be in a position to meaningfully evaluate and discuss the case. “No bright line rule in respect of the length of jury deliberations triggers a finding that deliberations have progressed too far to permit the substitution of an alternate.” Joel Williams, supra, 171 N.J. at 169, 793 A.2d 594. Instead, the court should consider such factors as the timing of the juror’s departure, his or her explanation of the problem prompting the inquiry, and any communications from the jury that may indicate whether deliberations have progressed to the point at which a reconstituted and properly charged jury will be unable to conduct open and mutual deliberations.
This Court has considered these factors in several settings. In Joel Williams, the Court rejected the Appellate Division panel’s conclusion that the juror’s departure occurred at a “critical time,” and that the juror’s comment that he “gave it [his] best shot” implicated the deliberative process, barring substitution. Id. at 168-69, 793 A.2d 594 (alteration in original). There, the juror’s request to be excused for financial reasons followed approximately three hours of deliberations. Id. at 159, 793 A.2d 594. Because the jury asked for “a readback of critical identification testimony” immediately before the juror was excused, and deliberated for several hours after the substitution of a new juror before reaching [150]*150a verdict, the Court surmised that “[t]he jury could not have reached a determination of guilt or innocence” in advance of the substitution. Id. at 169, 793 A.2d 594. The Court did not consider the deliberations “to have progressed to such a point that the new juror would not have [had] a realistic opportunity to share in the deliberative process.” Id. at 170, 793 A.2d 594.
This Court’s opinion in Jenkins, supra, 182 N.J. 112, 861 A.2d 827, arose in a different context. There, a juror claimed to identify with the defendant because of his race, and “unequivocally expresse[d] her unwillingness or inability to put aside bias and passion and follow the law.” Id. at 119, 123, 861 A.2d 827. The Court therefore held that the trial court could have properly excused the juror due to her bias. Id. at 130, 861 A.2d 827. It found, however, that despite a good faith and earnest effort to address a difficult situation, the trial court had inadvertently elicited from the juror information about the positions of other jurors regarding the merits of the case. Id. at 134, 861 A.2d 827. Cautioning judges to avoid such disclosures by warning jurors not to reveal the substance of a jury’s confidential discussions, the Court held that it was error for the trial judge to have permitted the reconstituted jury to deliberate in these circumstances, and remanded for a new trial. Id. at 134-35, 137, 861 A.2d 827.
The Court reached a similar conclusion in Corsaro, supra, 107 N.J. 339, 526 A.2d 1046. In that case, the jury reached a partial verdict before the trial court replaced a juror who had briefly vanished and returned to court, apparently intoxicated. Id. at 341-42, 526 A.2d 1046. In the wake of a partial verdict by the original jury, the Court held that it was plain error to substitute an alternate for a juror at that late stage:
[W]here the deliberative process has progressed for such a length of time or to such a degree that it is strongly inferable that the jury has made actual fact-findings or reached determinations of guilt or innocence, the new juror is likely to be confronted with closed or closing minds. In such a situation, it is unlikely that the new juror will have a fair opportunity to express his or her views and to persuade others. Similarly, the new juror may not have a realistic opportunity to understand and share completely in the deliberations that brought the jurors to [151]*151particular determinations, and may be forced to accept findings of fact upon which he or she has not fully deliberated.
[Id. at 352, 526 A.2d 1046.]
Thus, when the circumstances suggest a strong inference that the jury has affirmatively reached a determination on one or more factual or legal issues, the trial court should not substitute an alternate for an excused juror. See id. at 354, 526 A.2d 1046.
We derive from these cases several principles to guide a trial court’s determination as to whether a reconstituted jury will meaningfully deliberate. First, the trial judge should conduct any inquiry of the juror seeking to be excused with caution, and should direct the juror not to reveal confidential jury communications. See Jenkins, supra, 182 N.J. at 134-35, 861 A.2d 827. Second, the trial court may consider the duration of the jury’s deliberations prior to the departure of the juror. Without applying an inflexible rule that would preclude substitution after a specific amount of time has elapsed, the trial court should determine whether the jury appears to have progressed to a stage at which issues have been decided and deliberations cannot commence anew. See Joel Williams, supra, 171 N.J. at 169-70, 793 A.2d 594. Third, if a partial verdict has been rendered, or the circumstances otherwise suggest that jurors have decided one or more issues in the case, the trial court should not authorize a juror substitution, but should declare a mistrial. See Jenkins, supra, 182 N.J. at 132-33, 861 A.2d 827; Corsaro, supra, 107 N.J. at 352-54, 526 A.2d 1046.
Finally, if the trial court permits the substitution of an alternate juror for an excused juror, it must instruct the newly composed jury before its deliberations. The trial court should charge the jury that the excused juror’s departure was prompted by personal issues, rather than by his or her view of the case or relationships with other jurors, that the reconstituted jury should not speculate on the reasons for the juror’s departure, and that the jury should begin deliberations anew by setting aside their previous discussions so that the reconstituted jury may conduct full and complete deliberations. The Model Criminal Jury Charge, revised following this Court’s decision in Jenkins, accu[152]*152rately and concisely conveys those instructions. See Model Jury Charge (Criminal), “Judge’s Instructions When Alternate Juror Empaneled After Deliberations Have Begun” (Jan. 14, 2013).4
Applying these principles to this case, we hold that the trial court’s decision to substitute an alternate for the ill juror after the deadlock had been announced did not constitute plain error. Nothing in the original jury’s communications with the trial court suggested that any juror had reached a determination on a factual or legal issue. There was no indication that the jury was unable to engage in open-minded discussions after the substitution. Indeed, the trial court charged the jury to conduct fair and mutual deliberations, and we presume that its instructions were followed. See State v. Winder, 200 N.J. 231, 256, 979 A.2d 312 (2009).
Although the original jury deliberated for a significant period and requested a readback of evidence prior to the substitution, it did not announce or imply that it had rendered a partial verdict or that it had otherwise “reached a determination of guilt or innocence.” Joel Williams, supra, 171 N.J. at 169, 793 A.2d 594. In contrast to the settings of Corsaro and Jenkins, there was no suggestion in the trial court’s cautious inquiry of the excused juror that the juror’s inability to continue derived from her view of the case or her discussions with her colleagues. There was no evidence that the juror in question was a holdout juror, that she manifested bias, that she had confronted hostile or intractable colleagues, or that disputes had arisen in the jury room. Instead, [153]*153the precipitating event was clearly the juror’s illness, which was sufficiently debilitating to preclude her further service.
Moreover, in the wake of the trial court’s proper instruction to the jury to begin deliberations anew, the newly constituted jury undertook protracted deliberations. The jury met for more than sixteen hours over four days. It sought and received a readback of testimony distinct from that requested by the original jury. It rendered a verdict only after deliberating for a period sufficient to permit an open and thorough discussion of the issues.
In reversing the trial court’s judgment, the Appellate Division panel relied upon the holding in Banks, supra, 395 N.J.Super. at 218, 928 A.2d 842, another Appellate Division decision. In Banks, after the jury declared an impasse and the trial court instructed it pursuant to Czachor to continue deliberating, the jury asked the trial court how it should address a juror who “may hold personal bias towards the police or victims due to prior circumstances.” Id. at 211, 218, 928 A.2d 842. After interviewing the jurors individually, the trial court “concluded that the problem juror’s inability to function was personal and unrelated to his interaction with the other members of the jury,” and thus dismissed the juror. Id. at 214, 928 A.2d 842. The defendant then made a motion for a mistrial, which the trial court denied. Ibid.
The Appellate Division in Banks reversed and remanded for a new trial. Id. at 220, 928 A.2d 842. It confirmed the propriety of the Czachor charge given by the trial court, but concluded that the jury’s initial declaration of an impasse itself “indicates that deliberations have progressed to a point where the individual jurors have made determinations about the evidence and facts,” thereby compelling a mistrial. Id. at 211, 218, 928 A.2d 842. The panel cited Corsaro and Jenkins as authority for its holding on this issue. Id. at 218, 928 A.2d 842.
The Appellate Division panel in Banks correctly applied Jenkins, supra, 182 N.J. at 130-31, 861 A.2d 827, to hold that the excused juror’s manifest bias warranted a mistrial. Id. at 216, 861 A.2d 827. It incorrectly concluded, however, that a trial court [154]*154may never substitute an alternate for an excused juror after an initial declaration of a deadlock and a Czachor charge. Id. at 219, 413 A.2d 593. In authorizing continued deliberations following a deadlock and an instruction, this Court declined to hold in Czachor, supra, that an initial impasse signals the end of meaningful deliberations. 82 N.J. at 404-06, 413 A.2d 593 (directing trial courts, in appropriate circumstances, to charge deadlocked jury to continue deliberations). To the contrary, the Czachor charge instructs jurors to consider the viewpoints of other jurors with an open mind. See Model Jury Charge (Criminal), “Judge’s Instructions on Further Jury Deliberations” (Jan. 14, 2013). In short, Czachor contemplates that a previously deadlocked jury can conduct fair and effective deliberations notwithstanding an earlier impasse.5 A juror substitution, necessitated by illness, that conforms with Rule 1:8 — 2(d)(1) does not alter that conclusion.6
Accordingly, we overrule the Appellate Division panel’s decision in Banks, supra, to the extent that it generally barred trial courts [155]*155from substituting a juror and directing new deliberations, by virtue of the fact that the original jury had reached an initial impasse and was charged in accordance with Banks, 395 N.J.Super. at 218-20, 928 A.2d 842.
We hold that in this case, the trial court properly responded to the original jury’s statement that it was at an impasse and to the subsequent illness of one juror. In each situation, the trial court determined the relevant facts without compromising the integrity of the jury’s deliberations, and instructed the jury in accordance with this Court’s decisions. In challenging circumstances, the court ensured that defendant received a fair trial. It committed no plain error warranting a new trial.
IV.
Therefore, the judgment of the Appellate Division is reversed, and the matter is remanded to the Appellate Division for consideration of the remaining issues that the panel did not reach in light of its resolution of the jury substitution issue.