GILMAN, J. (pp. 424-31), delivered a separate dissenting opinion.
OPINION
SUHRHEINRICH, Circuit Judge.
Richard Cooey, an Ohio inmate under sentence of death, filed this action against Ted Strickland, Governor, Terry J. Collins, Director, and E.C. Yoorhies, Warden (collectively “Defendants” or “State”) pursuant to 42 U.S.C. § 1983, challenging the constitutionality of Ohio’s lethal injection protocol. The issues before us in this interlocutory appeal are (1) whether a death row inmate’s claim against lethal injection itself — as opposed to a precursor procedure — is properly considered to be a habeas action or one brought pursuant to 42 U.S.C. § 1983, (2) whether a death row inmate’s § 1983 method-of-execution challenge accrues, for statute of limitations purposes, when execution is imminent or [414]*414at some earlier stage in state and federal proceedings, and (3) whether res judicata is a bar to a death row inmate’s claim concerning the means and methods of execution when similar issues were raised, or the specific claim could have been raised, in a previous habeas action.
I. Background
In 1986, an Ohio three-judge panel convicted Cooey of two counts of aggravated murder, and the panel sentenced him to death. The Ohio Supreme Court affirmed Cooey’s convictions and sentence on direct appeal. See State v. Cooey, 46 Ohio St.3d 20, 544 N.E.2d 895 (1989), and the United States Supreme Court denied certiorari on April 1, 1991, see Cooey v. Ohio, 499 U.S. 954, 111 S.Ct. 1431, 113 L.Ed.2d 482 (1991). Cooey unsuccessfully sought post-conviction relief pursuant to Ohio Rev. Code Ann. § 2953.21. See State v. Cooey, 1994 WL 201009 (Ohio Ct.App. May 25, 1994). The Ohio Supreme Court declined jurisdiction over his further appeal from this decision. Cooey subsequently sought to reopen his direct appeal on the basis of ineffective assistance of appellate counsel. The Ohio Court of Appeals denied his request to reopen on the basis of procedural default because Cooey had not established good cause for not filing his application to reopen within ninety days of the July 1, 1993, effective date of Ohio App. R. 26(B). The Ohio Supreme Court affirmed. See State v. Cooey, 73 Ohio St.3d 411, 653 N.E.2d 252 (1995).
In October 1996, Cooey filed a petition for a writ of habeas corpus under 28 U.S.C. § 2254. The district court denied the petition on September 4, 1997. See Cooey v. Anderson, 988 F.Supp. 1066 (N.D.Ohio 1997). This Court granted a certificate of appealability as to two issues and denied relief as to both. See Cooey v. Coyle, 289 F.3d 882 (6th Cir.2002). The United States Supreme Court denied cer-tiorari on March 31, 2003. Ohio originally set Cooey’s execution date for July 24, 2003.
On July 21, 2003, Cooey filed a motion for relief from judgment pursuant to Fed. R.Civ.P. 60(b) and a motion for stay of execution. On July 23, 2003, the district court granted Cooey’s motion for a stay of execution and deferred ruling on the Rule 60(b) motion. Both the Sixth Circuit and the Supreme Court denied the Warden’s motions to vacate the stay of execution. The district court ultimately denied the Rule 60(b) motion, and this Court denied Cooey’s application for a certificate of ap-pealability from the denial of his Rule 60(b) motion and his motion for leave to file a second or successive habeas petition.
On June 10, 2004, Cooey and another inmate, Adremy Dennis, filed a complaint alleging that the lethal injection protocol constitutes cruel and unusual punishment in violation of the Eighth Amendment. Ohio utilizes three drugs in performing lethal injection: sodium thiopental, pancu-rionium bromide, and potassium chloride. The sodium thiopental is designed to anesthetize the prisoner and render him unconscious. Next, the pancuronium bromide paralyzes all of the prisoner’s voluntary muscles but does not affect his sensation, consciousness, or ability to feel pain. Finally, the potassium chloride induces cardiac arrest. Dennis and Cooey asserted that if the sodium thiopental is not administered properly and in sufficient dosage, the prisoner could experience intense pain after being injected with the potassium chloride, but would be unable to convey the sensation due to the paralyzing agent in pancuronium bromide. They also maintained that to subject the prisoner to such excruciating pain while he is still conscious would amount to cruel and unusual punishment. They also alleged that the person[415]*415nel attending to the executions are inadequately trained and, as such, Defendants’ execution methods would violate a prisoner’s constitutional rights.
The district court dismissed the complaint because Cooey failed to exhaust his administrative remedies. After exhausting them, Cooey re-filed his complaint on December 8, 2004.1 On January 4, 2005, Defendants moved to dismiss the complaint based on the statute of limitations and res judicata, in addition to arguing that Cooey’s complaint should be construed as a successive habeas petition. On March 28, 2005, the district court denied the defendants’ motion but granted them permission to pursue this interlocutory appeal. On March 30, 2005, Defendants asked the district court to certify for immediate appeal the three arguments made in their motion to dismiss. On April 13, 2005, the district court granted the motion, in part, as to the issue of whether Cooey’s claims are barred by the statute of limitations. Defendants then sought permission to appeal the three issues pursuant to 28 U.S.C. § 1292(b). This Court granted the request as to all three issues.
We later granted a stay pending the Supreme Court’s decision in Hill v. McDonough, - U.S. -, 126 S.Ct. 2096, 165 L.Ed.2d 44 (2006), which was decided on June 12, 2006. After that decision, the parties filed supplemental briefs addressing its impact on this case. The parties also submitted second supplemental briefs discussing the impact of recent changes in Ohio’s lethal injection protocol on the issues pending before this Court. The matter was argued before this Court on December 7, 2006.
II. Analysis
This Court reviews de novo the district court’s grant or denial of a motion to dismiss under Fed.R.Civ.P. 12(b)(6). Mezibov v. Allen, 411 F.3d 712, 716 (6th Cir.2005), cert. denied, — U.S.-, 126 S.Ct. 1911, 164 L.Ed.2d 663 (2006). In this analysis, we must construe the complaint in the light most favorable to the plaintiff, accept all of his factual allegations, and determine whether he undoubtedly can prove no set of facts in support of his claims that would entitle him to relief. Columbia Natural Res., Inc. v. Tatum, 58 F.3d 1101, 1109 (6th Cir.1995).
A. § 1983 vs. § 2254
Cooey sought relief pursuant to 42 U.S.C. § 1983, alleging that the proposed lethal injection protocol would constitute cruel and unusual punishment in violation of the Eighth Amendment. In their motion to dismiss, Defendants argued that Cooey’s claim should have been presented in a petition for a writ of habeas corpus under 28 U.S.C. § 2254, rather than as a § 1983 claim. In Hill, the Supreme Court addressed this same issue and concluded that a death penalty plaintiff could raise his challenge in a § 1983 action. Relying on its earlier decision in Nelson v. Campbell, 541 U.S. 637, 645 — 47, 124 S.Ct. 2117, 158 L.Ed.2d 924 (2004), the Court concluded that the plaintiffs action was properly brought under § 1983 because it did not present a general challenge to his execution by lethal injection, but rather limited the challenge to the specific protocol currently used by the defendants. Hill, 126 S.Ct. at 2101-02. In their supplemental brief, Defendants acknowledge that Hill defeats their argument.
[416]*416B. Timeliness
Defendants also argue that Cooey’s § 1983 action is barred by the statute of limitations. The Supreme Court has held that § 1983 claims are best characterized as tort actions for the recovery of damages for personal injury and that federal courts must borrow the statute of limitations governing personal injury actions from the state where the § 1983 action was brought. Wilson v. Garcia, 471 U.S. 261, 275-76, 105 S.Ct. 1938, 85 L.Ed.2d 254 (1985). If a state has more than one statute of limitations for personal injuries, the state’s residual or general statute of limitations governing personal injury actions is applied to all § 1983 actions brought in that state. Owens v. Okure, 488 U.S. 235, 249-50, 109 S.Ct. 573, 102 L.Ed.2d 594 (1989). This Court has held that a two-year statute of limitations applies to § 1983 claims in Ohio. Banks v. City of Whitehall, 344 F.3d 550, 553 (6th Cir.2003) (citing Browning v. Pendleton, 869 F.2d 989 (6th Cir.1989) (en banc)).
On the other hand, as the Supreme Court recently made clear, federal law determines when the statute of limitations for a civil rights action begins to run. Wallace v. Kato, No. 05-1240, — U.S. -, -, 127 S.Ct. 1091, 1095, — L.Ed.2d-, 2007 WL 517122, at *3 (Feb. 21, 2007). “Under those principles, it is ‘the standard rule that [accrual occurs] when the plaintiff has complete and present cause of action.’ ” Wallace, — U.S. at -, 127 S.Ct. 1091, 1095, 2007 WL 517122, at *3 (quoting Bay Area Laundry & Dry Cleaning Pension Trust Fund v. Ferbar Corp. of Cal, 522 U.S. 192, 201, 118 S.Ct. 542, 139 L.Ed.2d 553 (1997)). This occurs “when ‘the plaintiff can file suit and obtain relief.’ ” Id. (quoting Bay Area Laundry, 522 U.S. at 201, 118 S.Ct. 542).
This Court has previously stated that “[u]nder federal law, as developed in this Circuit, the statute of limitations period begins to run when the plaintiff knows or has reason to know that the act providing the basis of his or her injury has occurred.” (6th Cir.2001); Collyer v. Darling, 98 F.3d 211, 220 (6th Cir.1996); Ruff v. Runyon, 258 F.3d 498, 500-01 (6th Cir.2001) (same); Sevier v. Turner, 742 F.2d 262, 273 (6th Cir.1984). Stated differently, “[i]n determining when the cause of action accrues in § 1983 cases, we look to the event that should have alerted the typical lay person to protect his or her rights.” Trzebuckowski v. City of Cleveland, 319 F.3d 853, 856 (6th Cir.2003). We must therefore look at when the harm in question occurred, guided by the principle that “[a] plaintiff has reason to know of his injury when he should have discovered it through the exercise of reasonable diligence.” Sevier, 742 F.2d at 273.
Defendants have the burden of demonstrating that the statutory period had run before Cooey filed his action. Griffin v. Rogers, 308 F.3d 647, 653 (6th Cir.2002). We review de novo the district court’s conclusion that Cooey’s complaint was filed within the applicable statutory period. Kelly v. Burks, 415 F.3d 558, 560 (6th Cir.2005).
Cooey was sentenced to death in 1986. His conviction and sentence were affirmed by the Ohio Supreme Court on direct appeal in 1989, and the United States Supreme Court affirmed in 1991. Lethal injection became available as a means of execution in Ohio in 1993. In 2001, it became Ohio’s sole method of execution.2 [417]*417This Court denied federal habeas relief in 2002, and the United States Supreme Court denied certiorari on March 31, 2008. Cooey’s execution date was set for July 24, 2003.
The record also reflects that, at least as early as April 2002, information about the protocol was available upon request. Attached to Cooey’s complaint is a letter dated April 19, 2002, from Warden Havi-land disclosing the chemical mixture and equipment to be used.3 See also Deborah W. Denno, When Legislatures Delegate Death: The Troubling Paradox Behind State Uses of Electrocution and Lethal Injection and What it Says About Us, 63 Ohio St. L.J. 63, 146 (2002) (explaining that as of 2001, Ohio had a vague written policy, but that more specific information was available upon request); Mary Beth Lane, “How State Plans to Kill Berry; Execution to Take About Six Minutes” Cleveland Plain Dealer (February 17, 1999) (describing the three drugs in the lethal injection protocol, which a nine-page DRC policy and state officials explained). A follow-up letter from staff counsel for the Ohio Department of Rehabilitation and Correction dated May 30, 2002, further describes the procedures used by prison personnel in performing lethal injection and the quantities used under this formulation.4
The district court concluded that Cooey’s claim accrued when his execution became imminent and he knew or had reason to know of the facts that gave rise to his specific method-of-execution challenge. In defining when an execution becomes imminent, the district court stated that it was “of the view that an execution becomes imminent not necessarily when an execution date is set, but when all other legal challenges to the validity of a death sentence come to an end, ie., when the plaintiff has exhausted all of his state and federal avenues of relief.” This occurs “when the United States Supreme Court [418]*418denies certiorari in the plaintiffs habeas corpus proceeding or otherwise issues a decision foreclosing federal habeas corpus relief.” In determining when a plaintiff knows or has reason to know the facts giving rise to his specific method-of-execution claim, the district court stated that because Ohio’s protocol is a creation of the Ohio Department of Rehabilitation and Correction, and therefore subject to change until the time of execution,
requiring a death-sentenced plaintiff to file his method-of-execution challenge any sooner ... [would be] wasteful and possibly absurd, given the possibility that, prior to his execution becoming imminent, a plaintiff could see his conviction or death sentence reversed, or the alteration of the precise execution protocol that plaintiff might seek to challenge as unconstitutional.
Applying this test to Cooey, the district court concluded that “Cooey knew or had reason to know of the facts giving rise to the specific allegations he has presented in the instant complaint in May 2002” when he received information about the protocol, and that his execution became imminent when the United States Supreme Court denied certiorari as to his habeas corpus proceedings on March 31, 2003; “[thus, Cooey] had two years from that date to file his method-of-execution claim.” Because Cooey filed the instant action on December 8, 2004, three months before the expiration of the statute of limitations, the district court deemed his cause of action was timely-
The district court also commented that, as the protocol was not established by statute or administrative rule, it was subject to change at any time before the execution. Because Defendants could change the protocol up to the time of an inmate’s execution, the district court believed that it would be premature to challenge the protocol until the execution was imminent.
On appeal, Defendants argue that the statute of limitations began to run in 1993, when lethal injection became available as a means of execution in Ohio, or alternatively in 2001, when lethal injection became Ohio’s sole method of execution. Defendants assert that it is the issuance of a government order, in this case the protocol, rather than the carrying out of that order, which starts the clock. Cooey urges us to affirm the district court’s conclusion that his claim accrued on March 31, 2003, when the United States Supreme Court denied certiorari as to Cooey’s first habeas petition and after his execution date was set.
Setting an accrual date at the point when the actual harm is inflicted, i.e., at the point of execution, is problematic in this context because the death-sentenced inmate’s claim would not accrue until he was executed, at which time it would also be simultaneously moot. In any event, both Nelson and Hill establish inferentially that § 1983 method-of-execution challenges may be brought before the execution is carried out. Neither case, however, addressed the appropriate accrual date. Thus, the relevant “event that should have alerted a lay person to protect his rights” must be redefined here.
If the point of infliction is not a viable option, the most logical choice of a triggering event is the point when the death penalty is ordered, upon judgment of conviction and sentence. At least one Court has set the accrual date at the conclusion of direct review by the state. See Neville v. Johnson, 440 F.3d 221, 222 (5th Cir.2006) (per curiam) (holding, in reliance on a concession by the state, that a challenge to a method of execution may be filed any time after the plaintiffs conviction has be[419]*419come final on direct review).5 This is also an attractive choice because it marks the point at which the state has rendered its criminal judgment final and, absent collateral civil proceedings, the point at which the state sets the execution date. Furthermore, the death-sentenced inmate can file suit and obtain relief.
The district court’s conclusion that the accrual date occurs when execution is imminent and all state and federal remedies have been exhausted is problematic for several reasons. First, it subverts the purpose of statutes of limitations, which are designed to “promote judicial economy and protect defendants’ rights.” John Hancock Fin. Servs., Inc. v. Old Kent Bank, 346 F.3d 727, 734 (6th Cir.2003) (and also noting that the discovery rule “has been applied to prevent unjust results when a plaintiff would otherwise be denied a reasonable opportunity to bring suit due to the latent nature of the injury or the inability to discover the causal connection between the injury and the defendant’s action” (internal quotation marks omitted)). As the Supreme Court noted in Wallace:
“Under the traditional rule of accrual ... the tort cause of action accrues, and the statute of limitations commences to run, when the wrongful act or omission results in damages. The cause of action accrues even though the full extent of the injury is not then known or predictable.” 1 C. Corman, Limitation of Actions § 7.4.1, pp. 526-527 (1991) (footnotes omitted); see also 54 C.J.S., Limitations of Actions § 112, p. 150 (2005). Were it otherwise, the statute would begin to run only after a plaintiff became satisfied that he had been harmed enough, placing the supposed statute of repose in the sole hands of the party seeking relief.
Wallace, — U.S. at-, 127 S.Ct. 1091, 1096, 2007 WL 517122, at *4.
More fundamentally, setting an accrual date at the point of imminency plus exhaustion of federal collateral remedies adds a significant period of delay to a state’s ability to exercise its sovereign power and to finalize its judgments, which disrupts the vital yet delicate balance between state and federal relations. “Our federal system recognizes the independent power of a State to articulate societal norms through criminal law; but the power of a State to pass laws means little if the State cannot enforce them.” McCleskey v. Zant, 499 U.S. 467, 492, 111 S.Ct. 1454, 113 L.Ed.2d 517 (1991). Furthermore, “a State retains a significant interest in meting out a sentence of death in a timely fashion.” Nelson, 541 U.S. at 644, 124 S.Ct. 2117.
Of course, “[fjederal habeas review of state convictions frustrates both the States’ sovereign power to punish offenders and their good faith-attempts to honor constitutional rights.” Calderon v. Thompson, 523, U.S. 538, 555-56, 118 S.Ct. 1489, 140 L.Ed.2d 728 (1998) (internal quotation marks omitted). For this reason, federal habeas review of state court judgments is limited. As the Supreme Court observed in Calderon:
[420]*420In light of “the profound societal costs that attend the exercise of habeas jurisdiction,” Smith v. Murray, 477 U.S. 527, 539, 106 S.Ct. 2661, 91 L.Ed.2d 434 (1986), we have found it necessary to impose significant limits on the discretion of federal courts to grant habeas relief. See, e.g., McCleskey v. Zant, 499 U.S. 467, 487, 111 S.Ct. 1454, 113 L.Ed.2d 517 ... (1991) (limiting “a district court’s discretion to entertain abusive petitions”); Wainwright v. Sykes, 433 U.S. 72, 90-91, 97 S.Ct. 2497, 53 L.Ed.2d 594 ... (1977) (limiting courts’ discretion to entertain procedurally defaulted claims); Teague v. Lane, 489 U.S. 288, ... 308-10, 109 S.Ct. 1060, 103 L.Ed.2d 334 (1989) (plurality opinion of O’CONNOR, J.) (limiting courts’ discretion to give retroactive application to “new rules” in habeas cases); Brecht v. Abrahamson, 507 U.S. 619, 637-38, 113 S.Ct. 1710, 123 L.Ed.2d 353 ... (1993) (limiting courts’ discretion to grant ha-beas relief on the basis of “trial error”).
Id. at 554-55, 118 S.Ct. 1489. The Court added that “[t]hese limits refleet our enduring respect for “the State’s interest” in the finality of convictions that have survived direct review within the state court system.” Id. at 555, 118 S.Ct. 1489 (citation omitted).
The Antiterrrorism and Effective Death Penalty Act of 1996 reflects Congress’s desire to restore and maintain the proper balance between state criminal adjudications and federal collateral proceedings. See generally Rhines v. Weber, 544 U.S. 269, 274, 125 S.Ct. 1528, 161 L.Ed.2d 440 (2005) (stating that “[t]he enactment of AEDPA in 1996 dramatically altered the landscape for federal habeas corpus petitions”).
There is no doubt Congress intended AEDPA [the Antiterrorism and Effective Death Penalty Act of 1996] to advance [the] doctrines [of comity, finality, and federalism]. Federal habeas corpus principles must inform and shape the historic and still vital relation of mutual respect and common purpose existing between the States and the federal courts. In keeping this delicate balance we have been careful to limit the scope of federal intrusion into state criminal adjudications and to safeguard the States’ interest in the integrity of their criminal and collateral proceedings.
Williams v. Taylor, 529 U.S. 420, 436, 120 S.Ct. 1479, 146 L.Ed.2d 435 (2000); see also Woodford v. Garceau, 538 U.S. 202, 206, 123 S.Ct. 1398, 155 L.Ed.2d 363 (2003) (“Congress enacted AEDPA to reduce delays in the execution of state and federal criminal sentences, particularly in capital cases, ... and to further the principles of comity, finality, and federalism.” (internal quotes omitted)); Williams v. Taylor, 529 U.S. 362, 386, 120 S.Ct. 1495, 146 L.Ed.2d 389 (2000) (Stevens, J.,) (stating that “Congress wished to curb delays, to prevent ‘retrials’ on federal habeas, and to give effect to state convictions to the extent possible under law”); see also id. at 404, 120 S.Ct. 1495 (majority opinion). In addition to revising the standards for evaluating the merits of a habeas application, see 28 U.S.C. § 2254(d) (1996) (providing that a writ of habeas corpus shall not be granted to a state prisoner unless the state court proceedings “resulted in a decision that was contrary to, or involved an unreasonable application of, clearly established Federal law,” or “resulted in a decision that was based on an unreasonable determination of the facts in light of the evidence presented in the State court proceedings”), the AEDPA created a one-year statute of limitations for filing a federal habeas petition, running from “the date on which the judgment became final by the conclusion of direct review or the expiration of the time for seeking such review.” [421]*42128 U.S.C. § 2244(d)(1)(A) (1996). See generally Day v. McDonough, 547 U.S.198, -n. 1, 126 S.Ct. 1675, 1680 n. 1, 164 L.Ed.2d 376 (2006) (noting that “[u]ntil AEDPA took effect in 1996, no statute of limitations applied to habeas petitions”). The one-year limitation period “quite plainly serves the well-recognized interest in the finality of state court judgments ... [and] reduces the potential for delay on the road to finality by restricting the time that a prospective federal habeas petitioner has in which to seek federal habeas review.” Duncan v. Walker, 533 U.S. 167, 179, 121 S.Ct. 2120, 150 L.Ed.2d 251 (2001) (internal citation omitted); see also Acosta v. Artuz, 221 F.3d 117, 123 (2d Cir.2000) (“The AEDPA statute of limitation promotes judicial efficiency and conservation of judicial resources, safeguards the accuracy of state court judgments by requiring resolution of constitutional questions while the record is fresh, and lends finality to state court judgments within a reasonable time.”) (quoted with approval in Day v. McDonough)).
The concerns articulated by the Supreme Court both pre- and post-AEDPA, and by Congress in the AEDPA itself, apply with equal force in this case, which “fall[s] at the margins of habeas.” Nelson, 541 U.S. at 646,124 S.Ct. 2117 (noting that the method-of-injection challenges “fall at the margins of habeas”). Indeed, the Court’s recent decisions in Hill and Nelson reflect this core concern that federal habeas should not displace a state’s authority to execute its judgments. In Nelson, the Supreme Court stated that “method-of-execution” challenges should be “brought at such a time as to allow consideration of the merits, without requiring the entry of a stay.” 541 U.S. at 650, 124 S.Ct. 2117; see also Gomez v. U.S. Dist. Court, 503 U.S. 653, 654, 112 S.Ct. 1652, 118 L.Ed.2d 293 (1992) (criticizing inmate for filing “method-of-execution” challenge pursuant to 42 U.S.C. § 1983 more than a decade after the completion of his direct appeal, and shortly before his execution); White v. Johnson, 429 F.3d 572, 574 (5th Cir.2005) (per curiam) (rejecting an inmate’s § 1983 “method-of-execution” challenge where the inmate had “been on death row for more than six years”). Most recently, in Hill, the Supreme Court emphasized that filing a § 1983 action challenging the constitutionality of certain aspects of a state’s execution does not “entitle the complainant to an order staying [his] execution as a matter of course.” Hill, 126 S.Ct. at 2104. The Court added that “[b]oth the State and the victims of [the] crime have an important interest in the timely enforcement of [the] sentence.” Id. Thus, an inmate intending to assert such a challenge generally must file his suit in sufficient time to “allow consideration of the merits, without requiring entry of a stay” of execution. Id. (quoting Nelson, 541 U.S. at 650, 124 S.Ct. 2117). The Nelson Court also stated “flat out” that “[t]he federal courts can and should protect States from dilatory or speculative suits.” Rutherford v. McDonough, 466 F.3d 970, 974 (11th Cir.2006) (quoting Hill, 126 S.Ct. at 2104). This Court adheres to these principles. See, e.g., Hicks v. Taft, 431 F.3d 916 (6th Cir.2005) (pre-Hill, cited with approval in Hill; ruling that a last-minute petition by a death row inmate, filed six days before his scheduled execution, was not entitled to a stay of execution even though the district court had allowed him to intervene if a fellow inmate’s § 1983 challenge to Ohio’s lethal injection protocol); Alley v. Little, 186 Fed.Appx. 604, (6th Cir.), reh’g en banc denied, 452 F.3d 621 (6th Cir.), cert. denied, — U.S. -, 126 S.Ct. 2975, 165 L.Ed.2d 982 (2006).
Thus, since the “date” the lethal injection protocol is imposed is infeasible, [422]*422it stands to reason that the next most appropriate accrual date should mirror that found in the AEDPA: upon conclusion of direct review in the state court or the expiration of time for seeking such review. See 28 U.S.C. § 2244(d)(1)(A) (1996).6 All of the same concerns articulated by the Supreme Court and as reflected in the AEDPA are relevant here. Like federal habeas actions, a § 1983 method-of-execution challenge “implicates values beyond the concerns of the parties.” See Acosta, 221 F.3d at 123 (and noting that the AEDPA statute of limitation was Congress’ primary vehicle for streamlining the habeas review process and lending finality to state convictions).
Thus, under this standard, Cooey’s claim would have accrued in 1991, after the United States Supreme Court denied direct review. However, Ohio did not adopt lethal injection until 1993, or make it the exclusive method of execution until 2001, so the accrual date must be adjusted because Cooey obviously could not have discovered the “injury” until one of those two dates. We need not pinpoint the accrual date in this case, however, because even under the later date, 2001, Cooey’s claim exceeds the two-year statute of limitations deadline because his claim was not filed until December 8, 2004.
Cooey asserts, and the district court found, that Cooey did not have actual knowledge of Ohio’s protocol until May 2002 when he received responses to his inquiries from the Warden. Actual knowledge, however, is not the appropriate measure; the test is whether he knew or should have known based upon reasonable inquiry, and could have filed suit and obtained relief. Cooey should have known of his cause of action in 2001 after amendments to the law required that he be executed by lethal injection, and the information was publicly available upon request. Yet, even if we accepted (and we would not) May 2002, the date when he received the Warden’s response, Cooey’s complaint is still untimely.
Cooey also argues that the statute of limitations did not begin to run until the Nelson decision made a § 1983 action a possible remedy for Cooey. Prior to that 2004 decision, this Court precluded a death row inmate from filing a § 1983 action challenging his method of execution. See In re Sapp, 118 F.3d 460, 464 (6th Cir.1997); In re Williams, 359 F.3d 811 (6th Cir.2004). Indeed, in Williams, the plaintiff attempted to bring a § 1983 action raising the same argument now presented by Cooey, and this Court concluded that the claim must be raised in a § 2254 habe-as action. Nonetheless, “the plaintiff in Nelson was similarly barred by circuit precedent at the time he filed his suit. So long as there remains the possibility of en banc reconsideration and Supreme Court review, circuit law does not completely foreclose all avenues for relief.” Harris v. Johnson, 376 F.3d 414, 418-19 (5th Cir.2004). This Circuit’s precedent did not prevent Lewis Williams and John Roe from filing their lethal injection § 1983 actions. See In re Williams, 359 F.3d 811 (6th Cir.2004).7
[423]*423Lastly, Cooey argues, and the district court found, that the fluid nature of Ohio’s execution protocol requires imminency of execution to be a key factor in the accrual calculus, citing Stewart v. Martinez-Villareal, 523 U.S. 637, 644-45, 118 S.Ct. 1618, 140 L.Ed.2d 849 (1998). We recently rejected a similar argument in Alley. In Alley, a Tennessee inmate also argued that his § 1983 claim challenging Tennessee’s lethal injection protocol was not ripe until an execution date was imminent. In rejecting this argument we stated:
Alley’s brief cites Stewart v. Martinez-Villareal, 523 U.S. 637, 118 S.Ct. 1618, 140 L.Ed.2d 849 ... (1998) as prohibiting courts from considering challenges such as the one in our case before a petitioner’s execution reaches imminence. We reject this reading of this precedent. In that case, unlike in ours, the defendant’s claim under Ford v. Wainwright, 477 U.S. 399, 106 S.Ct. 2595, 91 L.Ed.2d 335 ... (1986), had originally been dismissed without prejudice. The Supreme Court’s ruling merely allowed the claim to proceed in a habeas petition at a later date. The Court noted that the lower courts had specifically left open the possibility that the defendant’s Ford claim could proceed in a future filing. Id. at 640, 118 S.Ct. 1618.... No such procedural history informs the posture of the § 1983 claim in our case. Moreover, we note that claims involving mental competency are inherently different from the § 1983 petition before us in at least one respect: mental competency is subject to variance over time. It is indeed possible that last-minute first-instance Ford petitions could be justified by a change in a defendant’s mental health.
Id. at 607.
In contrast, while the lethal injection protocol in this case is subject to change, there was no evidence, until recently, that the protocol had ever been changed. And, furthermore, the recent changes do not relate to Cooey’s core complaints.
During the pendency of this appeal, indeed while the matter was stayed, Cooey moved to expand supplemental briefing or to remand to the district court to further address Ohio’s recent changes in its execution protocol, which he claimed is consistent with his claim that the malleable nature of Ohio’s lethal injection protocol means that a § 1983 action cannot be imminent until close to the date of execution. In support, Cooey attached a memo written by Ohio Department of Rehabilitation and Correction Director Terry Collins, dated June 27, 2006. In that memo Collins adopted five “recommendations and process changes” regarding Ohio’s execution protocol.
Ohio’s recent amendments to its lethal injection protocol resulted from difficulties encountered during the execution of Joseph Clark on May 2, 2006. When preparing Clark for execution, prison officials could find only one accessible vein in Clark’s arms to establish a heparin lock, through which the lethal drugs are administered. (Two locks usually are inserted.) However, once the execution began and the drugs were being administered, this vein collapsed, and Clark repeatedly ad[424]*424vised officials that the process was not working. Officials stopped the lethal injection procedure, and after a significant period of time, were able to establish a new intravenous site. The process then was restarted, and Clark was executed.
To avoid similar difficulties in future executions, Ohio made several changes to its lethal injection protocol. First, officials removed time deadlines that previously dictated executions begin by a certain hour, and be completed within a narrow time frame. Second, prisoners are given more in-depth medical examinations prior to execution. Third, correctional personnel will make every effort to obtain two sites for heparin locks before proceeding to the execution chamber. Fourth, personnel will no longer use “high pressure” saline injections to check the viability of the intravenous lines. Instead, a “low pressure” drip of saline will be used to keep the line open and confirm its ongoing viability. Fifth, correctional personnel will observe each inmate’s arms and check for signs of intravenous incontinence while the drugs are being administered to the inmate.
As Defendants assert, none of these changes relates to Cooey’s core complaints. Further, none of these areas were implicated as a basis for Cooey’s expert’s conclusion that the process presents a risk that Cooey will experience pain. Rather, Dr. Heath, Cooey’s expert, criticized the use of pancuronium bromide, the use and dosage of sodium thiopental, the failure to provide a continuous dose of an ultra-short-acting barbiturate, and the lack of information regarding prison personnel’s training to prepare and administer the drugs. Cooey cannot prevail on this basis either.
In sum, we hold that the district court erred in ruling that the statute of limitations had not run on Cooey’s method-of-execution claim because it used an improper test for establishing the accrual date for § 1983 method-of-injection challenges.
C. Res Judicata
Because we conclude that Cooey’s claim fails on limitations grounds, we need not address the State’s res judicata argument.
III. Conclusion
For the foregoing reasons, we REMAND this matter to the district court with instructions to DISMISS Cooey’s § 1983 complaint with prejudice as barred by the statute of limitations.