This appeal asks, essentially, a single question: Must a district court, at a reconvened sentencing hearing following a defendant’s successful appeal, reexamine its explicit findings and conclusions on an issue not raised in the appeal and which the defendant had previously acknowledged to be correctly decided? Because we do not believe that the district court is under so wide-ranging an obligation, we affirm the judgment below.
I.
Prior Proceedings
Defendant-appellant Richard Harmon Bell pleaded guilty to an indictment detailing six prior felony convictions and charging him with receipt and possession of a firearm by a convicted felon in violation of 18 U.S.C. § 922(g)(1) (1988). Believing that Bell met all three criteria for career offender status,
1
see, e.g., United States v. Fiore,
At the sentencing hearing, Bell renewed this argument. Withal, his counsel declared no fewer than three times, and Bell himself stated at least twice, that even if Bell’s argument prevailed, he would be subject to a mandatory minimum sentence of 15 years as his prior convictions were sufficient to place him within the purview of the Armed Career Criminal Act (ACCA), 18 U.S.C. § 924(e)(1) (1988) (stipulating that a defendant is considered an armed career criminal if he has three prior convictions for violent felonies and if the offense of conviction is possession of a firearm which has traveled across state lines). In the course of the sentencing proceedings, the district court found that Bell had been convicted previously of a half-dozen violent crimes listed in the PSI Report, including assault and battery with a dangerous weapon, kidnapping, and various episodes of robbery. The defendant lodged no objection to this finding; to the exact contrary, statements made by both Bell and his counsel patefied its accuracy. Nevertheless, the court concluded that the offense of conviction was itself a crime of violence as defined in U.S.S.G. § 4B1.1 and sentenced Bell to a prison term in excess of 30 years as a career offender rather than to a shorter period of incarceration as an armed career criminal.
Bell appealed the sentence.' On appeal, his counsel vigorously disputed whether a felon-in-possession conviction could lawfully trigger the career offender guideline. Counsel conceded, however, that “based upon [Bell’s] prior record, he is subject to an enhancement ... of 15 years to life under the Armed Career Criminal [Act].” We bought counsel’s wares, holding “that, where the offense of conviction is the offense of being a convicted felon in knowing possession of a firearm, the conviction is not for a ‘crime of violence’ and that, therefore, the career offender provision of the federal sentencing guidelines does not apply.”
United States v. Bell,
At the resumed sentencing hearing, Bell for the first time sought to challenge the validity of his prior convictions and, through that medium, his ACCA status. The district court ruled that the objection was untimely. It sentenced Bell as an *250 armed career criminal. This appeal ensued.
II.
Discussion
Bell strives gallantly to persuade us that the district court was obliged to entertain his belated challenge to some or all of the six predicate convictions; or, in the alternative,, that the court abused its discretion in refusing to do so. We find both parts of this asseverational array unconvincing.
A.
The first of appellant’s contentions is easily dispelled. An appellate court’s disposition of an appeal must be read against the backdrop of prior proceedings in the case.
See United States v. Cornelius,
Here, our mandate disposing of Bell’s original appeal directed the district court to conduct resentencing “in accordance with the opinion issued” in that appeal. The context of that order was the opinion
itself—an
opinion which discussed, in some detail,
see Bell,
The black letter rule governing this , point is that a legal decision made at one stage of a civil or criminal case, unchallenged in a subsequent appeal despite the existence of ample opportunity to do so, becomes the law of the case for future stages of the same litigation, and the aggrieved party is deemed to have forfeited any right to challenge that particular decision at a subsequent date.
See Williamsburg Wax Museum, Inc. v. Historic Figures, Inc.,
B.
Even where, as here, an appellate court’s mandate does not contemplate resurrecting an issue on remand, the trial
*251
court may still possess some limited discretion to reopen the issue in very special-situations.
See id.
at 150-52;
Cochran v. M & M Transp. Co.,
Here, reopening an already decided matter cannot be justified. At a minimum, reopening would require a showing of exceptional circumstances — a threshold which, in turn, demands that the proponent accomplish one of three things: show that controlling legal authority has changed dramatically; proffer significant new evidence, not earlier obtainable in the exercise of due diligence; or convince the court that a blatant error in the prior decision will, if uncorrected, result in a serious injustice.
See, e.g., Rivera-Martinez,
III. CONCLUSION
We need go no further. The law of the case doctrine dictates that all litigation must sometime come to an end.
See Arizona v. California,
Affirmed,
Notes
. Bell was more than eighteen years old at the time he perpetrated the offense of conviction; that offense was a crime of violence; and his record contained six prior convictions for violent felonies.
. The commentators have noted considerable uncertainty about whether a district court is always obligated to conform the scope of its inquiry on remand with the appellate court's mandate. See, e.g., 18 C. Wright, et al., Federal Practice and Procedure § 4478, at 793 & n. 15 (1981 & Supp.1992). We believe that the weight of logic and authority pushes against so rigid a position, but we need not decide the issue squarely; even assuming the existence of residual discretion, we find no exceptional circumstances that would warrant the court below in peering behind our original mandate.
. It is true that
United States v. Paleo,
