Background
On September 1, 2015, Kimberly Leftwich, a former employee of the New Lisbon Development Center, was physically assaulted by a patient at her workplace. She continued working for approximately eight months before resigning in May 2016, then worked in another position for about eighteen months before retiring effective January 1, 2018. In October 2017, she applied to the Public Employees’ Retirement System (PERS) for accidental disability retirement benefits under N.J.S.A. 43:15A-46, which requires that a disability be a direct result of a traumatic event occurring during the performance of regular or assigned duties. Her application was considered concurrently for ordinary disability benefits as well.
In April 2018, the PERS Board granted Leftwich ordinary disability retirement benefits, conclusively determining that she was permanently disabled and unable to perform her regular duties at the time she separated from State service. Her accidental disability claim proceeded to an administrative hearing before an ALJ in early 2021. Medical testimony was divided: Leftwich’s experts attributed her disabling condition significantly to the 2015 assault, while the Board’s expert attributed it primarily to pre-existing degenerative factors. The ALJ denied accidental disability benefits in September 2022, concluding the assault was not the “direct cause” of her disability. The Board adopted that decision in October 2022. On Leftwich’s first appeal, the Appellate Division vacated the denial and remanded in March 2024, finding that the ALJ and Board had applied an incorrect causation standard. Under Gerba v. Board of Trustees, Public Employees’ Retirement System, 83 N.J. 174, 187 (1980), the proper standard is not whether the workplace incident was the sole or primary cause of the disability, but whether it was a “significant or substantial contributing cause.” The same ALJ again denied accidental disability benefits on remand in December 2024, and the Board adopted that decision without qualification in March 2025.
The Court’s Holding
The Appellate Division vacated and remanded a second time, finding the remand decision legally flawed in two independent respects. First, the ALJ re-examined the question of whether Leftwich was disabled at all — a question that was no longer open. The PERS Board had conclusively determined in April 2018 that Leftwich was permanently disabled when she separated from service, and the first Appellate Division opinion had restated that premise. That determination was the law of the case. By reconsidering whether Leftwich was actually unable to perform her duties at the time of retirement and reaching the opposite conclusion, the ALJ committed a legal error that infected the entire causation analysis, because the causation assessment was intertwined with the now-overturned disability finding.
Second, the remand decision repeated the very error that had generated the first remand: the ALJ again faulted Leftwich for not showing the assault was “the cause” of her degeneration, applying a causation standard stricter than what Gerba permits. As the panel emphasized, Gerba does not require a claimant to prove the traumatic event was the primary or sole cause of disability — only that it was a substantial and significant contributing cause. A pre-existing degenerative condition and a traumatic workplace event can each qualify independently as significant contributing causes; one does not logically exclude the other. Because the remand decision’s causation analysis was tainted by the law-of-the-case error and continued to misapply Gerba, the panel ordered a second remand. In an exercise of abundant caution, the panel also directed that the matter be assigned to a different ALJ on remand, to avoid any appearance of partiality stemming from the prior ALJ’s repeated adverse factual and legal conclusions.
Key Takeaways
- Under Gerba, a PERS accidental disability claimant need only show the qualifying traumatic workplace event was a “significant or substantial contributing cause” of the disabling condition — not the sole cause, primary cause, or “the” cause — and ALJs must apply this standard precisely, particularly after an appellate remand directing its application.
- The law-of-the-case doctrine applies in administrative proceedings: once a final determination has been made that a claimant is permanently disabled, that finding may not be revisited on remand, even by the same ALJ reconsidering a related but distinct legal question such as causation.
- When an ALJ on remand repeatedly departs from an appellate court’s express directions, reassignment to a new ALJ is an appropriate remedial measure to protect the integrity of the proceedings and avoid the appearance of partiality rooted in prior adverse determinations.
Why It Matters
Leftwich is a textbook example of how persistent legal error in a disability benefits proceeding can subject a claimant to years of litigation without resolution. For practitioners representing public employees in PERS accidental disability claims, the decision reinforces that Gerba’s “significant or substantial contributing cause” standard has real teeth and cannot be quietly displaced in individual cases by agencies or ALJs who are skeptical of the claimant’s medical proofs. Counsel should monitor remand decisions carefully for departures from the appellate mandate and, where the same ALJ has twice applied an erroneous framework, should affirmatively move for reassignment.
The law-of-the-case holding is equally important. Where an agency has already made a favorable finding — such as the determination that a claimant was permanently disabled — that finding travels with the case on remand and cannot be undone because the ALJ views the medical record differently on reconsideration. Practitioners should flag any attempt to relitigate settled premises as an independent legal error, separate from and in addition to any substantive causation arguments, to maximize the grounds for appellate relief if the agency again goes astray.