Date: Sep 24, 2026

An Unpleaded Employment Decision Cannot Support Damages Without Amendment or Consent

DiFronzo v. City of Somerville — United States Court of Appeals for the First Circuit, September 21, 2026

Introduction

Somerville police officer Dante DiFronzo sued city officials after his 2018 termination, alleging First Amendment retaliation under 42 U.S.C. § 1983 and tortious interference with his employment relationship under Massachusetts law. While the lawsuit was pending, an arbitrator ordered his reinstatement without back pay. Mayor Joseph Curtatone then placed him on paid administrative leave. That later decision prevented DiFronzo from earning overtime and other additional compensation, but DiFronzo never updated his complaint to challenge it.

The appeal presented two distinct questions: whether the jury could learn the outcome of the arbitration to assess damages from the termination, and whether it could award damages for the subsequent paid-leave decision. The First Circuit answered yes to the first and no to the second.

Summary of the Opinion

The court upheld the limited admission of the arbitrator’s order. Reinstatement without back pay explained the period for which DiFronzo could claim lost earnings from his termination. The district court excluded the arbitrator’s reasoning and instructed jurors to decide liability independently.

But the court reversed the damages attributable to the July 2021 paid-leave decision. The complaint alleged liability based on termination, not the later, separate decision. Although both concerned the same employment dispute, the motive for placing DiFronzo on leave was a distinct, unpleaded factual issue. The defendants repeatedly objected to trying it as a basis for relief; they did not consent, and DiFronzo never sought to amend his pleading.

The jury had separately awarded $200,000 in lost compensation and $300,000 in emotional-distress damages for conduct after the paid-leave decision. The First Circuit reversed those awards and remanded. It left undisturbed the separately identified $300,000 emotional-distress award for earlier conduct; the jury had awarded no lost compensation for that earlier period.

Analysis

Arbitration Evidence: Context for Damages, Not Proof of Retaliation

The defendants argued that admitting the arbitral decision risked inviting jurors to adopt the arbitrator’s conclusions. The First Circuit distinguished between using an award to establish the merits of a statutory claim and using its operative terms to calculate damages. The jury needed to know that DiFronzo had been ordered reinstated, ending the period of unpaid termination, but had not received back pay for that period. It did not need to hear why the arbitrator reached those conclusions.

Under Federal Rule of Evidence 403, relevant evidence may be excluded when its probative value is substantially outweighed by a danger such as unfair prejudice. Here, the damages-related value of the limited evidence, the exclusion of the arbitrator’s reasoning, and an instruction requiring the jury to make its own decision supported admission. The court did not hold that the arbitration established retaliation or tortious interference.

The Pleading Rule: An “Issue” Can Be Narrower Than a Claim

Federal Rule of Civil Procedure 8(a) requires a short and plain statement giving fair notice of a claim and its grounds. DiFronzo’s allegation that damage from his termination and associated publicity “continues to this day” described continuing effects of pleaded conduct. It did not give notice that he sought to impose liability for a different employment decision made months after he filed suit.

That distinction drove the court’s reading of Rule 15(b). An unpleaded issue is not limited to an entirely new legal claim: it can be a central factual predicate for an existing claim. A plaintiff therefore cannot avoid Rule 15(b) simply by retaining the same retaliation or tortious-interference label while asking the jury to award damages for a newly asserted act. The court contrasted an ongoing loss caused by termination with a later decision allegedly causing its own losses and requiring its own examination of motive and causation.

DiFronzo could have sought permission under Rule 15(d) to supplement his complaint with events occurring after it was filed. Having not done so, he needed to satisfy one of Rule 15(b)’s trial-stage routes:

Rule 15(b)(1): When the opposing party objects that evidence falls outside the pleaded issues, the proponent may seek an amendment. The court may allow it, considering the merits and prejudice, and may grant a continuance. DiFronzo made no such motion; the court could not supply one on its own.
Rule 15(b)(2): An unpleaded issue tried by the parties’ express or implied consent is treated as pleaded, even without a formal amendment. The defendants’ repeated objections foreclosed express consent, and their trial conduct did not establish implied consent.

In particular, defense counsel’s questions about the second Brady letter and Curtatone’s paid-leave decision did not amount to consent to try that decision as an independent basis for damages. The evidence also bore on a pleaded issue: whether the earlier termination reflected retaliation or a consistent response to prosecutors’ concerns about DiFronzo serving as a witness. Evidence relevant to an existing issue does not, merely by being introduced, signal agreement to litigate a new one.

Nor could an asserted lack of prejudice replace amendment or consent. The court also identified concrete potential prejudice: because the defendants understood termination to be the only pleaded basis for relief, they successfully sought to exclude testimony from Curtatone’s successor. That testimony might have addressed why DiFronzo remained on leave after Curtatone left office and, in turn, the scope of any damages attributable to Curtatone.

Precedents Cited

Alexander v. Gardner-Denver Co. supplied factors for weighing an arbitral ruling used as substantive evidence in a later statutory discrimination case. Those factors did not govern here because the arbitrator’s order was admitted only to explain the damages period, not to prove retaliation.
Lech v. von Goeler and Ruiz-Troche v. Pepsi Cola of P.R. Bottling Co. supplied the abuse-of-discretion standard for reviewing the evidentiary ruling. United States v. Villa-Guillen stated the Rule 403 balancing test, while United States v. Armenteros-Chervoni emphasized the considerable latitude afforded trial courts in applying it.
Jackson v. Bunge Corp. and Hayes v. Town of Dalton illustrated the prejudice that can arise when an arbitral ruling is offered as substantive proof on issues the jury must decide. The court distinguished both from the limited use here. United States v. Smith supported the value of a careful limiting instruction, and United States v. Freeman the presumption that jurors follow one.
Rodriguez v. Doral Mortg. Corp. instructed courts to read pleadings generously but also supplied the rule that implied consent cannot rest on evidence directly relevant to an already pleaded issue. Rinsky v. Cushman & Wakefield, Inc. emphasized fair notice; Artuso v. Vertex Pharms., Inc. and Ashcroft v. Iqbal reinforced the need for factual content identifying the misconduct on which liability rests.
Jimenez v. Tuna Vessel Granada and Dan Ryan Builders, Inc. v. Crystal Ridge Dev., Inc. were close procedural analogies: a party could not obtain relief on a materially different, unpleaded factual basis merely because the overarching legal claim remained the same.
Moncrief v. Williston Basin Interstate Pipeline Co. supported the requirement of a motion to amend under Rule 15(b)(1). Green Country Food Mkt., Inc. v. Bottling Grp., LLC explained why lack of prejudice alone does not cure the absence of such a motion after proper objections. In re Fustolo counseled against lightly inferring consent to try an unpleaded issue, and Kenda Corp. v. Pot O’Gold Money Leagues, Inc. reinforced that an absence of prejudice does not itself compel amendment.
Brady v. Maryland explained the name of the prosecutors’ disclosure letters concerning DiFronzo: the government must disclose favorable information to criminal defendants. The letters provided factual context for the officials’ asserted reasons for their employment decisions; they did not decide the civil claims.

Impact

The decision draws a practical boundary between proving continuing harm from a pleaded act and seeking relief for a later, allegedly wrongful act. In employment litigation, a subsequent suspension, leave placement, or refusal to restore duties may require a supplemental pleading—or, at trial, amendment or consent—even if it involves the same employee, officials, and alleged retaliatory motive.

It also cautions against treating discovery, advance awareness, or overlapping evidence as substitutes for notice in the pleadings. Conversely, a defendant may introduce evidence of a later event for a limited purpose without necessarily consenting to liability based on that event. Separate jury findings on damages can make a targeted reversal possible without retrying unaffected portions of the verdict.

Complex Concepts Simplified

Unpleaded issue: A material point the jury is asked to decide that the complaint did not identify—even if it falls under a familiar legal claim.
Supplemental pleading: A court-authorized update addressing events that happened after the original complaint was filed.
Implied consent: Conduct showing both sides understood and accepted that an unpleaded issue was being tried. Introducing evidence that also helps decide a pleaded issue is ordinarily insufficient.
Limiting instruction: A direction telling jurors the specific purpose for which they may consider evidence. Here, the arbitration outcome could inform damages, not dictate liability.

Conclusion

DiFronzo establishes that Rule 15(b)’s safeguards apply to a new factual basis for liability, not just a new legal claim. The First Circuit permitted narrow use of the arbitration outcome to calculate damages from the pleaded termination, but rejected damages for a later paid-leave decision that was neither pleaded nor properly brought into the trial by amendment or consent.