the same year, that he had been cashiered.5 The notice of his termination, though not in written form, was dear to Rivera, to his superiors, to the departmental paymaster, and to the district court. It is equally clear to us. Thus, the court below did not err in ruling that, as a matter of law, the cause of action accrued over a year before Rivera sued.
B.
Rivera’s argument to the contrary is deeply flawed. He contends that, well after he was fired, he continued to await a pre-termination hearing and abandoned this forlorn hope only when Agosto, the official who had brought the charges against him, resigned (making it “legally impossible,” in Rivera’s words, for Agosto to convene such a hearing). Until then, Rivera’s thesis runs, his injury did not become irretrievable, ergo, actionable. This construct, however, is predicated upon a fundamental misunderstanding of the applicable legal principles.
Due process required that appellant receive a pre-termination hearing. See Loudermill, 470 U.S. at 542-43, 105 S.Ct. at 1493. By definition, a pre-termination hearing is one that precedes dismissal. Appellant’s injury occurred, in constitutional terms, when he was discharged without first being heard. What Agosto did after Rivera was terminated could scarcely be relevant to the occurrence of that injury. Put another way, appellant’s knowledge that he had been fired was itself the best and most conclusive proof that Agosto had failed to provide him the opportunity for the constitutionally required pre-termi-nation hearing. In the circumstances at hand, appellant was not legally justified in waiting indefinitely once he possessed that crucial knowledge.
Appellant has a fallback position. Whatever might be the rule in a garden-variety case, he urges that a special rule applies here. He predicates this exhortation on the fact that, until Agosto resigned, he did not know to a certainty that no hearing would be held. Refined to bare essence, this exhortation is little more than a plea for special treatment because appellant misapprehended the legal consequences of his employer’s actions. We cannot, however, yield to this importuning. When an appellant knows of the fact of his injury, his mistake of law as to the time of its accrual should not be allowed to resurrect a time-barred cause of action. See Torres, 893 F.2d at 407, citing United States v. Kubrick, 444 U.S. 111, 122, 100 5.Ct. 352, 359, 62 L.Ed.2d 259 (1979) (in medical malpractice case, so long as the plaintiff is aware of “the critical facts that he has been hurt and who has inflicted the injury,” the statute of limitations is triggered); Nahmod, supra, § 9.04 at 253 (commenting that the medical malpractice discovery accrual rule “is also the rule in § 1983 cases”) (listing cases).
c.
In a last-ditch effort to avoid the unavoidable consequences of his own lassitude, appellant attempts to invoke the doctrine of equitable tolling. His proffer comes too late.
Rivera did not make an equitable tolling argument in his opening brief. Rather, the asseveration surfaced for the first time in his reply brief. It is well settled in this court, for good reason which need not be rehearsed here, that a legal argument made for the first time in an appellant’s reply brief comes too late and need not be addressed. See Sandstrom v. Chemlawn Corp., 904 F.2d 83, 86 (1st Cir.1990). Rivera’s equitable tolling argument was waived on appeal.6
5
Rivera’s deposition was taken in Spanish. The certified translation includes the following exchange: The context makes pellucidly clear that the question’s reference to “that time" referred to sometime in 1988 (most likely April).
6
We hasten to add that the proffer not only came too late, but contained too little. There are no facts in evidence remotely approaching the kind and quantum of proof that might be *355necessary, at the summary judgment stage, to undermine the limitations defense. See, e.g., Rivera-Gomez v. de Castro, 900 F.2d 1, 3 (1st Cir.1990) (discussing requirements for invocation of equitable tolling doctrine in employment discrimination cases under 42 U.S.C. § 1983); Torres, 893 F.2d at 407-08 (similar); cf. Jensen, 912 F.2d at 520 (discussing requirements for equitable tolling in Title VII case).