Cite as: 512 U. S. 154 (1994)
Opinion of Blackmun, J.
See Barclay v. Florida, 463 U. S. 939, 948-951 (1983) (plurality opinion); California v. Ramos, 463 U. S., at 1008 ("Once the jury finds that the defendant falls within the legislatively defined category of persons eligible for the death penalty . . . the jury then is free to consider a myriad of factors to determine whether death is the appropriate punishment"). Thus, 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; they urge the jury to sentence the defendant to death so that he will not be a danger to the public if released from prison. Eisenberg & Wells, Deadly Confusion: Juror Instructions in Capital Cases, 79 Cornell L. Rev. 1, 4 (1993).
Arguments relating to a defendant's future dangerousness ordinarily would be inappropriate at the guilt phase of a trial, as the jury is not free to convict a defendant simply because he poses a future danger; nor is a defendant's future dangerousness likely relevant to the question whether each element of an alleged offense has been proved beyond a reasonable doubt. But where the jury has sentencing responsibilities in a capital trial, many issues that are irrelevant to the guilt-innocence determination step into the foreground and require consideration at the sentencing phase. The defendant's character, prior criminal history, mental capacity, background, and age are just a few of the many factors, in addition to future dangerousness, that a jury may consider in fixing appropriate punishment. See Lockett v. Ohio, 438 U. S. 586 (1978); Eddings v. Oklahoma, 455 U. S. 104, 110 (1982); Barclay v. Florida, 463 U. S., at 948-951.
In assessing future dangerousness, the actual duration of the defendant's prison sentence is indisputably relevant. Holding all other factors constant, it is entirely reasonable for a sentencing jury to view a defendant who is eligible for parole as a greater threat to society than a defendant who is not. Indeed, there may be no greater assurance of a defend-
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