Erik Duran was leading an undercover operation when he knocked a Bronx man off his motorbike after throwing a cooler at him in 2023.
An official who was briefed on the investigation said Heifler, 26, identified as a member of the JDL 613 Brotherhood, a New Jersey-based group founded in 2024 that describes its membership as "Jewish warriors" fighting back against rising antisemitism.
In a Bronx courtroom, detectives and other witnesses have described how an undercover drug operation in 2023 led to a death and the criminal trial of a sergeant. A verdict is expected later this week.