A 21-year-old woman accused of fatally shooting a U.S. Border Patrol agent pleaded not guilty Friday in federal court in Burlington, Vermont, as prosecutors said they will seek the death penalty in the case.

Teresa Youngblut entered the plea during her first appearance on a superseding indictment that charges her with the murder of Agent David Maland, the assault of two other agents with a deadly weapon and related firearms offenses. The shooting occurred during a traffic stop in January, about 20 miles south of the Canadian border, according to court filings and statements from federal prosecutors.

The indictment was returned by a federal grand jury last month. Federal prosecutors have filed notice that they intend to pursue capital punishment in the case, and Attorney General Pamela Bondi has formally authorized that course of action, officials said. The acting U.S. attorney for the District of Vermont also filed a notice reflecting the decision.

The charges include counts that allege Youngblut killed Maland and wounded two other Border Patrol agents during the January traffic stop. The superseding indictment adds gun-related offenses to an earlier complaint. Youngblut’s plea of not guilty leaves those allegations to be proven at trial.

Federal authorities have said the defendant is linked to a group prosecutors have described as a “trans vegan” community that investigators have tied to multiple killings across the country. Those broader allegations have drawn law enforcement attention beyond Vermont, and prosecutors have indicated that the investigation into the group’s activities is ongoing.

Maland, a U.S. Border Patrol agent, was killed in the shooting, prompting a large local law enforcement response and a procession after his death. His body was transferred to a funeral home in Burlington, followed by a line of police vehicles and with Vermont State Troopers standing at attention during the procession.

David Maland

Court records show the case is being handled in federal district court in Burlington. Youngblut is charged under federal statutes that cover the murder and assault of federal officers and the use of firearms during violent crimes. The government’s decision to seek the death penalty triggers a number of procedural requirements, including pretrial filings and potential eligibility determinations under federal capital statutes.

Prosecutors have not released a trial date. Youngblut appeared with counsel at the hearing and entered her plea without extended comment. No plea agreement was announced.

The killing and the investigation into the linked group have raised questions among local and federal officials about motive and the scope of alleged criminal activity. Authorities have said they are continuing to examine connections to other incidents and to gather evidence that could be presented at trial.

As the case moves forward in federal court, the use of capital charges ensures heightened scrutiny from the judiciary and appellate system. Decisions by prosecutors to pursue the death penalty in federal cases often prompt additional legal filings and extended pretrial proceedings.

Youngblut remains in federal custody pending further court proceedings. The U.S. attorney’s office in Vermont and federal law enforcement agencies did not immediately provide further comment beyond court filings and the notices regarding the death-penalty authorization.