SUMMARY ORDER

Timothy Hefferan, a public school teacher employed by the Norwalk Board of Education, appeals from a grant of summary judgment for the school board and its superintendent, Dr. Salvatore Corda (collectively, the “school defendants”), on federal due process claims, and for the teachers union and its president, Bruce Mellion (with the union collectively, the “union defendants”), on his state law claim that the union defendants breached their duty to represent him fairly in disciplinary proceedings brought by the school board.1 We review an award of summary judgment de novo, construing the facts in the light most favorable to the non-moving party, and resolving all ambiguities and drawing all reasonable inferences against the mov-ant. See Pucino v. Verizon Wireless Commc’ns, Inc., 618 F.3d 112, 117 (2d Cir. 2010). We assume the parties’ familiarity with the facts and record of prior proceedings, referencing them only as necessary to explain our decision.

Procedural Due Process Claims

The district court awarded summary judgment to the school board and Corda on Hefferan’s Fourteenth Amendment due process claims because Hefferan failed to file a grievance within the thirty-day period specified in the collective bargaining agreement. Hefferan argues that the union’s breach of its duty of fair representation excused him from any exhaustion obligation. Strictly speaking, what is at issue is not exhaustion, which is not a prerequisite to a valid claim under 42 U.S.C. § 1983, see Chase Grp. Alliance LLC v. City of N.Y. Dep’t of Fin., 620 F.3d 146, 153 (2d Cir. 2010), but the failure of the plaintiff to make use of an adequate post-deprivation remedy such as a grievance hearing.2 We have held that such failure will defeat a procedural due process claim on the merits, even if the post-deprivation remedy is no longer available at the time of suit. See Segal v. City of N.Y., 459 F.3d 207, 218 n. 10 (2d Cir. 2006); Hellenic Am. Neighborhood Action Comm. v. City of N.Y., 101 F.3d 877, 881-82 (2d Cir.), cert. dismissed, 521 U.S. 1140, 118 S.Ct. 15, 138 L.Ed.2d 1048 (1997).

“[A] procedural due process violation cannot have occurred when the governmental actor provides apparently adequate procedural remedies and the plaintiff has not availed himself of those remedies.” N.Y. State Nat’l Org. for Women v. Pataki, 261 F.3d 156, 169 (2d Cir.), cert. denied, 534 U.S. 1128, 122 S.Ct. 1066, 151 L.Ed.2d 969 (2002). Hefferan either knew or should have known of the complained of irregularities prior to the grievance deadline and chose not to take advantage of available process. Therefore, Hefferan’s procedural due process claims fail.

If, as the plaintiff argues, his failure to make use of the grievance procedure is attributable to the union defendants’ breach of their duty of fair representation, *89this fact would not permit the plaintiffs due process claim against the school defendants to proceed. It might, however, enable him to bring a state law claim for breach of the duty of fair representation against the union defendants, a possibility discussed infra. See Armstrong v. Meyers, 964 F.2d 948, 951 (9th Cir. 1992); Winston v. U.S. Postal Serv., 585 F.2d 198, 210 (7th Cir. 1978); Gansas v. City of N.Y., 240 Fed.Appx. 485, 438 (2d Cir. 2007).

Substantive Due Process Claim

“Generally speaking, ‘[f]or state action to be taken in violation of the requirements of substantive due process [under the Fourteenth Amendment], the denial must have occurred under circumstances warranting the labels ‘arbitrary’ and ‘outrageous.’ ” Kuck v. Danaher, 600 F.3d 159, 167 (2d Cir. 2010) (quoting Natale v. Town of Ridgefield, 170 F.3d 258, 262 (2d Cir. 1999)). Here, nothing in the record suggests that the school defendants’ actions “shock[ ] the conscience,” Rochin v. California, 342 U.S. 165, 172, 72 S.Ct. 205, 96 L.Ed. 183 (1952), overruled on other grounds by Mapp v. Ohio, 367 U.S. 643, 81 S.Ct. 1684, 6 L.Ed.2d 1081 (1961), or constitute a “gross abuse of governmental authority,” Natale, 170 F.3d at 263. The plaintiffs substantive due process claim fails.

“Stigma-Plus” Defamation and False Light Claims

A defamation action “can be grounded in 42 U.S.C. § 1983 when th[e] plaintiff can demonstrate ‘a stigmatizing statement plus a deprivation of a tangible interest.’ ” Vega v. Lantz, 596 F.3d 77, 81 (2d Cir. 2010) (quoting Algarin v. Town of Wallkill, 421 F.3d 137, 138 (2d Cir. 2005)). “[I]n order to bring a successful stigma-plus claim, the plaintiff also must demonstrate that her liberty was deprived without due process of law. Stated differently, the availability of adequate process defeats a stigma-plus claim.” Segal, 459 F.3d at 213. Because the plaintiff has not established that adequate process was unavailable, his stigma-plus claim fails. The same holds true for the plaintiffs false-light claims, which are identical in all material aspects to the defamation claims.

Fair Representation Claim

Hefferan argues that there are disputed issues of material fact as to whether the union defendants breached their duty, under Conn. Gen.Stat. § 7-468(d), to represent him fairly with respect to disciplinary proceedings initiated against him by the school board. Because we uphold the district court’s judgment insofar as it granted summary judgment to the school defendants on the plaintiffs federal causes of action, we vacate the district court’s judgment insofar as it reached the merits of the plaintiffs state law claims against the union defendants, and we remand with instructions to decline to exercise supplemental jurisdiction over the plaintiffs state law claims against the union defendants. See Brzak v. United Nations, 597 F.3d 107, 113-14 (2d Cir.), (“[I]f a plaintiffs federal claims are dismissed before trial, the state claims should be dismissed as well.” (internal quotation marks and citation omitted)), cert. denied, — U.S.-, 131 S.Ct. 151, 178 L.Ed.2d 243 (2010); Oneida Indian Nation of N.Y. v. Madison County, 665 F.3d 408, 444 (2d Cir. 2011) (“We remand wit instructions to the district court to decline to exercise supplemental jurisdiction over these claims and to dismiss them without prejudice to their being brought in state court.”).

Conclusion

We have considered Hefferan’s remaining arguments on appeal and conclude that they are without merit. Accordingly, the *90judgment of the district court is hereby AFFIRMED in part as to the plaintiffs federal claims. The judgment is hereby VACATED in part as to any state law-claims against the union defendants, and the matter is REMANDED to the district court with instructions to decline to exercise supplemental jurisdiction over any such claims and to dismiss them without prejudice.