Justice Souter
delivered the opinion of the Court.
Last Term, we reiterated the holding of Simmons v. South Carolina, 512 U. S. 154 (1994), that when “a capital defendant’s future dangerousness is at issue, and the only sentencing alternative to death available to the jury is life imprisonment without possibility of parole, due process entitles the defendant ‘to inform the jury of [his] parole ineligibility, either by a jury instruction or in arguments by counsel.’ ” Shafer v. South Carolina, 532 U. S. 36, 39 (2001) (quoting Ramdass v. Angelone, 530 U. S. 156, 165 (2000) (plurality opinion)). In this ease, the Supreme Court of South Carolina held Simmons inapposite for two reasons: state law provided the jury with a third sentencing alternative, and future dangerousness was not at issue. Each reason was error.
I
In 1996, the State of South Carolina indicted petitioner William Kelly for an extraordinarily brutal murder, kidnap-ing, and armed robbery, and for possession of a knife during the commission of a violent crime. The jury convicted Kelly on all charges.
The trial then proceeded to a separate sentencing phase calling for the jury to determine whether any aggravating factor had been shown and, if so, to choose between recommendations of death or life imprisonment. The prosecutor began by telling the jurors that “I hope you never in your lives again have to experience what you are experiencing right now. Being some thirty feet away from such a person. Murderer.” App. 64. He went on to present testimony that while in prison, Kelly had made a knife (or shank) and had taken part in an escape attempt, even to the point of planning to draw a female guard into his cell where he would hold her hostage. See id., at 129-132,140-141. The prosecutor’s cross-examination of a psychologist brought out evidence of Kelly’s sadism at an early age, see id., at 218, and his inclination to kill anyone who rubbed him the wrong way, see id., at 195.
After presentation of this evidence but before closing arguments, Kelly’s counsel relied on Simmons in requesting the judge to instruct the jurors that if Kelly received a sentence of life imprisonment, he would be ineligible for parole. The instruction she sought was a near-verbatim excerpt of S. C. Code Ann. § 16-3-20 (2000 Cum. Supp.):
“‘[L]ife imprisonment’ means imprisonment until the death of the offender. No person sentenced to life imprisonment is eligible for parole, community supervision, or any early release program, nor is the person eligible to receive any work credits, education credits, good conduct credits, or any other credits that would reduce the mandatory life imprisonment required by law.” 343 S. C. 350, 360, 540 S. E. 2d 851, 856 (2001).
The prosecutor objected that “I’m not going to argue future dangerous[ness]. So that takes it out of Simmons anyhow.” App. 245. The defense responded that “the State ha[d] already raised future dangerousness” through presentation of sentencing phase evidence, “calling correctional officers to testify to an escape attempt, to testify to the fact that [Kelly] had possession of a shank, by calling inmates who testified to [Kelly’s] behavior in the jail. . . [and] his plan to take a female guard hostage.” Ibid. Defense counsel argued that the State’s cross-examination of the psychologist reinforced the other evidentiary indications of Kelly’s future dangerousness. Id., at 245-246. The trial court denied the requested instruction, saying that the State’s evidence went to Kelly’s character and characteristics, not to future dangerousness. Id., at 249.
The sentencing proceeding then closed with arguments in which the prosecutor spoke of Kelly as “the butcher of Bates-burg,” “Bloody Billy,” and “Billy the Kid.” Id., at 267-268. The prosecutor told the jurors that “[Kelly] doesn’t have any mental illness. He’s intelligent. . . . He’s quick-witted. Doesn’t that make somebody a little more dangerous — ” id., at 269. Defense counsel interrupted the prosecutor in mid-sentence with an objection, presumably for raising Kelly’s future dangerousness. The prosecutor nonetheless went on immediately, “ — for this lady, this crime on January the 5th, doesn’t that make him more unpredictable for [the victim] Shirley Shealy.” Ibid. Kelly’s counsel did not renew her objection, and the trial court never ruled on the objection entered. The prosecutor continued that “murderers will be murderers. And he is the cold-blooded one right over there.” Id., at 272.
After the closing arguments, the trial judge instructed the jury that in choosing between recommendations of death and life imprisonment, it should consider the possible presence of five statutory aggravating circumstances, and three possible statutory mitigating circumstances. The judge explained “that the terms ‘life imprisonment’ and ‘death sentence’ are to be understood in this ordinary and plain meaning.” Id., at 289. But, in accordance with the earlier ruling, the court did not say that under South Carolina law, a convicted murderer sentenced to life imprisonment was ineligible for parole, nor did the court instruct that Kelly’s future dangerousness was not in issue. At the end of the charge, Kelly’s counsel renewed her objection to the court’s refusal to give her requested Simmons instruction or, in the alternative, to inform the jury that the State had stipulated that future dangerousness was not in issue in the case. App. 304. After deliberating for 43 minutes, the jury found five statutory aggravating circumstances beyond a reasonable doubt and returned a recommendation of death, id., at 305-307, to which the trial court acceded.
On appeal to the Supreme Court of South Carolina, Kelly assigned error to the trial court’s refusal to instruct that he would be ineligible for parole under a life sentence. The State Supreme Court ruled otherwise and gave two alternative grounds for affirming the sentence. First, it followed the trial court in saying that the State’s evidence at sentencing did not raise future dangerousness and so did not trigger Simmons: “[W]e agree with the trial court that the State’s evidence at sentencing did not implicate future dangerousness. ... In our opinion, the evidence presented by the State in the penalty phase was designed to show that Kelly would not adapt to prison life ....” 343 S. C., at 362, 540 S. E. 2d, at 857. Second, relying on its own ruling in State v. Shafer, 340 S. C. 291, 531 S. E. 2d 524 (2000), rev’d, Shafer v. South Carolina, 532 U. S. 36 (2001), the state court held that Simmons had no application to the sentencing regime in place at Kelly’s trial. 343 S. C., at 364, 540 S. E. 2d, at 858. The State Supreme Court committed error on each point. We granted certiorari, 533 U. S. 928 (2001), and now reverse.
HH HH
We take the State Supreme Court’s reasons out of order, for the second one can be answered with little more than citation to Shafer, in which we reversed a South Carolina judgment last Term. The state court said that “Simmons is inapplicable under [South Carolina’s] new sentencing scheme because life without the possibility of parole is not the only legally available sentence alternative to death.” 343 S. C., at 364, 540 S. E. 2d, at 858. That statement mistakes the relationship of Simmons to the state sentencing scheme. It is true that a defendant charged with murder carrying the possibility of a death sentence can, under some circumstances, receive a sentence less than life imprisonment. But, as we explained in Shafer, under the South Carolina sentencing scheme a jury now makes a sentencing recommendation only if the jurors find the existence of an aggravating circumstance. When they do make a recommendation, their only alternatives are death or life without parole. 532 U. S., at 49-50. We therefore hold, as we did in Shafer, that the state court’s reasoning is not to the point.
The State Supreme Court’s first ground, that Kelly’s future dangerousness was not “at issue,” is unsupportable on the record before us. It is not that the state court failed to pose the legal issue accurately, for in considering the applicability of Simmons it asked whether Kelly’s future dangerousness was “a logical inference from the evidence,” or was “injected into the case through the State’s closing argument.” 343 S. C., at 363, 540 S. E. 2d, at 857; see also Shafer, supra, at 54-55 (whether prosecutor’s evidence or argument placed future dangerousness in issue); Simmons, 512 U. S., at 165, 171 (plurality opinion) (future dangerousness in issue because “State raised the specter of... future dangerousness generally” and “advanced] generalized arguments regarding the [same]”); id., at 174 (Ginsburg, J., concurring); id., at 177 (O’Connor, J., concurring in judgment). The error, rather, was on the facts: the evidence and argument cited by the state court are flatly at odds with the view that “future dangerousness was not an issue in this case.” 343 S. C., at 363, 540 S. E. 2d, at 857.
The court acknowledged the prosecutor’s “[e]vidence that Kelly took part in escape attempts and carried a shank,” id., at 362, 540 S. E. 2d, at 857, and that “he had been caught carrying a weapon and planning or participating in escape attempts,” ibid. The court concluded, however, that this evidence was not the sort contemplated by Simmons, that is, evidence demonstrating future danger ‘“if released from prison.’ ” 343 S. C., at 362, n. 8, 540 S. E. 2d, at 857, n. 8 (quoting Simmons, supra, at 163) (emphasis added by state court). The court saw the evidence as going only to Kelly’s likely behavior in prison, or to his proclivity to escape from it; the state court said that Kelly was allowed to rebut this evidence of his inability to adapt to prison life, but that explaining parole ineligibility would do nothing to rebut evidence that Kelly was an escape risk. 343 S. C., at 362-363, 540 S. E. 2d, at 857.
Even if we confine the evidentiary consideration to the evidence discussed by the State Supreme Court, the court’s conclusion cannot be accepted. To the extent that it thought that “[e]vidence that Kelly took part in escape attempts and carried a shank ... is not the type of future dangerousness evidence contemplated by Simmons,” id., at 362, 540 S. E. 2d, at 857, it overlooked that evidence of violent behavior in prison can raise a strong implication of “generalized ... future dangerousness.” Simmons, supra, at 171. (And, of course, the state court’s reasoning says nothing about the evidence of the crime, or of Kelly’s sadism generally, and his mercurial thirst for vengeance.) A jury hearing evidence of a defendant’s demonstrated propensity for violence reasonably will conclude that he presents a risk of violent behavior, whether locked up or free, and whether free as a fugitive or as a parolee.
The fallacy of the State Supreme Court’s attempt to portray the thrust of the evidence as so unrealistically limited harks back to a comparable mistake by the trial judge, who spoke of the evidence as going, not to future dangerousness, but “to [Kelly’s] character and characteristics.” App. 249. The error in trying to distinguish Simmons this way lies in failing to recognize that evidence of dangerous “character” may show “characteristic” future dangerousness, as it did here. This, indeed, is the fault of the State’s more general argument before us, that evidence of future dangerousness counts under Simmons only when the State “introduces] evidence for which there is no other possible inference but future dangerousness to society.” Brief for Respondent 27 (emphasis in original). Evidence of future dangerousness under Simmons is evidence with a tendency to prove dangerousness in the future; its relevance to that point does not disappear merely because it might support other inferences or be described in other terms.
The prosecutor accentuated the clear implication of future dangerousness raised by the evidence and placed the case within the four corners of Simmons. He had already expressed his hope that the jurors would “never in [their] lives again have to experience . . . [b]eing some thirty feet away from such a person” as Kelly. App. 64. The State Supreme Court made no mention of this, despite its thrust: since the jurors were unlikely to be spending any time in prison, they would end up 30 feet away from the likes of Kelly only if he got out of prison, as he might if parole were possible. The argument thus echoed the one made in Simmons itself, that the imposition of the death penalty was an act of “self-defense.” Both statements “implied that petitioner would be let out eventually if the jury did not recommend a death sentence.” 512 U. S., at 178 (O’Connor, J., concurring in judgment) (emphasis in original).
And there was more. The state court to be sure considered the prosecutor’s comparison of Kelly to a notorious serial killer, variously calling him a “dangerous” “bloody” "butcher.” The court nonetheless thought it could somehow cordon off these statements as raising nothing more than a call for retribution. 343 S. C., at 363, 540 S. E. 2d, at 857. But the import of the argument simply cannot be compartmentalized this way. Characterizations of butchery did go to retribution, but that did not make them any the less arguments that Kelly would be dangerous down the road. They complemented the prosecutor’s submissions that Kelly was “more frightening than a serial killer,” App. 260, and that “murderers will be murderers,” id., at 272. Thus was Kelly’s jury, like its predecessor in Simmons, invited to infer “that petitioner is a vicious predator who would pose a continuing threat to the community.” Simmons, supra, at 176 (O’Connor, J., concurring in judgment).
Perhaps because this is so undeniable, the State in its argument before us takes a tack never pursued by the state court, in claiming there was no need for instruction on parole ineligibility, because “there is nothing whatsoever to indicate that the jurors were concerned at all with the possibility of [Kelly’s] future release when they decided death was appropriate.” Brief for Respondent 47. But it cannot matter that Kelly’s jury did not ask the judge for further instruction on parole eligibility, whereas the Simmons and Shafer juries did. See Shafer, 532 U. S., at 44; Simmons, supra, at 160. A trial judge’s duty is to give instructions sufficient to explain the law, an obligation that exists independently of any question from the jurors or any other indication of perplexity on their part. Cf. C. Wright, Federal Practice and Procedure §485, p. 375 (3d ed. 2000) (“It is the duty of the trial judge to charge the jury on all essential questions of law, whether requested or not”). Time after time appellate courts have found jury instructions to be insufficiently clear without any record that the jury manifested its confusion; one need look no further than Penry v. Johnson, 532 U. S. 782 (2001), for a recent example. While the jurors’ questions in Simmons and Shafer confirmed the inadequacy of the charges in those cases, in each case it was independently significant that “[displacement of ‘the longstanding practice of parole availability’ remains a relatively recent development [in South Carolina], and ‘common sense tells us that many jurors might not know whether a life sentence carries with it the possibility of parole.’ ” 532 U. S., at 52 (quoting Simmons, supra, at 177-178 (O’Connor, J., concurring in judgment)).
Nor is there any reason to believe that Kelly’s jury was better informed than Simmons’s or Shafer’s on the matter of parole eligibility. The State, to be sure, emphasizes defense counsel’s opening statement that the jury’s recommendation would be “the sentence actually imposed and the sentence that will actually be carried out,” Record 1660, as well as counsel’s closing, which stressed that Kelly would be in prison for the rest of his life and would “never see the light of daylight again,” id., at 2060. The State stresses that the judge told the jury that the terms “life imprisonment” and “death sentence” should be understood in their plain and ordinary meanings. App. 289.
But the same things could be said of Shafer, where we explicitly noted defense counsel’s statement to the jury that Shafer would “ ‘die in prison’ after ‘spending] his natural life there,’ ” as well as the trial judge’s instructions that “ ‘life imprisonment .means until the death of the defendant.’ ” 532 U. S., at 52 (emphasis deleted). We found these statements inadequate to convey a clear understanding of Shafer’s parole ineligibility, id., at 53-54, and Kelly, no less than Shafer, was entitled to his requested jury instruction.
The judgment of the Supreme Court of South Carolina is reversed, and the case is remanded for proceedings not inconsistent with this opinion.
It is so ordered.
Although the State Supreme Court referred to this portion of the prosecutor’s argument, it did not indicate that defense counsel had objected between the prosecutor’s description of Kelly as “dangerous” and his subsequent characterization of Kelly as dangerous to the victim. 343 S. C. 350, 360, 540 S. E. 2d 851, 856 (2001).
Under South Carolina law, capital jurors first must decide whether the State has proven the existence of any statutory aggravating circumstance beyond a reasonable doubt. If the jury cannot agree unanimously on the presence of such a circumstance, it cannot make a sentencing recommendation; the judge is then charged with sentencing the defendant either to life imprisonment without parole or to a prison term of at least 30 years. S. C. Code Ann. §§ 16 — 8—20(B), (C) (2000 Cum. Supp.); State v. Starnes, 340 S. C. 312, 328, 531 S. E. 2d 907, 916 (2000). But, if the jury does unanimously find a statutory aggravating circumstance, it recommends one of two possible sentences: death or life imprisonment without the possibility of parole. §§ 16-3-20(A), (B). The jury has no other sentencing option.
The Chief Justice's dissent correctly notes that a required instruction on parole eligibility does not bar a prosecutor from arguing dangerousness in prison as a ground for choosing the death penalty. See post, at 261. The plurality acknowledged this possibility in Simmons v. South Carolina, 512 U. S. 154, 165, n. 5 (1994) (“[T]he fact that a defendant is parole ineligible does not prevent the State from arguing that the defendant poses a future danger”); see also id., at 177 (O’Connok, J., concurring in judgment) (when the defendant “bringfs] his parole ineligibility to the jury’s attention” “the prosecution is free to argue that the defendant would be dangerous in prison”). But the plurality also recognized that even if a “State [were] free to argue that the defendant will pose a danger to others in prison,” id., at 165, n. 5, the State was not free to “mislead the jury by concealing accurate information about the defendant’s parole ineligibility,” ibid.
As The Chief Justice says, see post, at 261 (dissenting opinion), it may well be that the evidence in a substantial proportion, if not all, capital cases will show a defendant likely to be dangerous in the future. See Simmons, supra, at 163 (plurality opinion) (noting that “prosecutors in South Carolina, like those in other States that impose the death penalty, frequently emphasize a defendant’s future dangerousness in their evidence and argument at the sentencing phase”). But this is not an issue here, nor is there an issue about a defendant’s entitlement to instruction on a parole ineligibility law when the State’s evidence shows future dangerousness but the prosecutor does not argue it. The only questions in this case are whether the evidence presented and the argument made at Kelly’s trial placed future dangerousness at issue. The answer to each question is yes, and we need go no further than Simmons in our discussion.
Nor, as the State Supreme Court thought, was evidence, elicited by the prosecution, that Kelly “took part in escape attempts,” 343 S. C., at 362, 540 S. E. 2d, at 857, somehow distinct from indications of dangerousness. It is true that evidence of propensity to escape does not necessarily put future dangerousness at issue, but here, the prosecution proffered evidence of at least one violent escape attempt. The evidence of Kelly’s plan to take a female guard hostage with a shank underscored a propensity for violence in addition to a predilection to escape.
The latter statement, in fact, speaks not to Kelly’s past conduct, but to his future deportment.
Whether this history of penology should suffice to require a Simmons instruction regardless of the details of evidence and argument going to future dangerousness is a question not raised by this case, in which evidence and argument did place dangerousness in issue.
If Kelly’s counsel had read the law verbatim to the jury with the judge’s manifest approval, that might have sufficed, but the State does not claim that defense counsel had any such opportunity, and conceded at oral argument that it is “very unlikely” that the trial judge would have permitted defense counsel to read to the jury the relevant section of the South Carolina Code. See Tr. of Oral Arg. 51.
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