Karen Friedman Agnifilo Makes the Double-Jeopardy Challenge Judge Gregory Carro Said Was Previously ‘Premature’
By Michele Evans
NYWeeklyRecord.com
August 14, 2026
NEW YORK — Luigi Mangione’s attorneys moved Friday to dismiss his pending Manhattan murder prosecution, transforming his federal guilty plea into an immediate challenge to whether New York can put him on trial a second time for the killing of UnitedHealthcare CEO Brian Thompson.
The move came after Mangione pleaded guilty Friday morning in Manhattan federal court to two federal stalking charges arising from Thompson’s Dec. 4, 2024 killing. Mangione admitted under oath that he planned the attack and shot Thompson in Manhattan.
Now his attorneys, led by Karen Friedman Agnifilo, are attempting to use that federal conviction to stop the separate state prosecution before jury selection begins Sept. 8.
The defense has filed a motion seeking dismissal of the New York case on double-jeopardy grounds, according to multiple reports following Friday’s federal proceeding.
The filing could force Justice Gregory Carro to confront a question he deliberately left open nearly a year ago.
Carro Previously Said the Argument Was Premature
Mangione’s lawyers have been raising double jeopardy for months, arguing that the federal and Manhattan prosecutions effectively seek to punish him twice for the same alleged conduct.
But when Carro ruled on Mangione’s earlier dismissal motions in September 2025, there had been no federal conviction.
That distinction was critical.
“As to the defendant’s motion to dismiss under double jeopardy grounds, that’s premature,” Carro said in his September ruling.
At the time, the judge noted that Mangione had not yet been tried in another jurisdiction on the same underlying facts. Carro denied both dismissal and the defense request to stay the Manhattan prosecution.
Friday changed that factual landscape dramatically.
Mangione has now been convicted in federal court through his guilty pleas.
The question is no longer what might happen if the federal prosecution concludes first.
It has concluded with convictions.
Mangione Admits the Killing in Federal Court
During Friday’s proceeding before U.S. District Judge Margaret M. Garnett, Mangione pleaded guilty to interstate stalking resulting in death and stalking through the use of interstate facilities resulting in death.
There was no plea agreement with federal prosecutors.
Mangione also made an extraordinary factual admission in open court.
“I shot Mr. Thompson in the back,” Mangione told the court, according to ABC News.
Mangione described researching UnitedHealthcare’s investor conference and planning the attack before traveling to New York. Judge Garnett accepted the guilty pleas and scheduled sentencing for Dec. 18.
Each federal count carries the possibility of life imprisonment.
The federal murder and firearms counts that once exposed Mangione to the death penalty had previously been dismissed, leaving the two stalking counts to which he pleaded guilty Friday.
The Fight Now Moves Back to Judge Carro
The immediate legal battle shifts several blocks north and back into New York Supreme Court, where Mangione remains charged with second-degree murder and weapons offenses.
That trial is presently scheduled to begin Sept. 8.
The defense argues that proceeding with it after Friday’s federal convictions would violate protections against successive prosecutions.
The federal Constitution ordinarily permits successive state and federal prosecutions under the “dual sovereignty” doctrine because New York and the federal government are separate sovereigns.
But Mangione’s argument potentially reaches further.
New York provides defendants with statutory double-jeopardy protections that can be broader than the federal constitutional rule.
That distinction has been at the center of the defense strategy.
The Manhattan District Attorney’s Office is expected to oppose dismissal and will have an opportunity to respond before Carro rules.
The Defense Has Been Building Toward This Moment
The issue is hardly new.
Mangione himself made the argument dramatically in court earlier this year after Carro scheduled his state trial ahead of the federal proceeding.
“One-plus-one is two,” Mangione shouted as he was being escorted from the courtroom. “Double jeopardy, by any common-sense definition!”
Friedman Agnifilo later publicly accused prosecutors of turning a constitutional protection on its head.
“Double Jeopardy is meant to protect people, and they are using it as a weapon here,” she said following that hearing.
Until Friday, however, those arguments confronted a fundamental problem: Mangione had not yet been convicted federally.
That obstacle has disappeared.
Manhattan Prosecutors Saw the Problem Coming
The Manhattan District Attorney’s Office was already preparing for precisely this scenario.
Before Friday’s plea, prosecutors had expressed concern that resolution of the federal case could affect their ability to proceed with the state prosecution.
The possibility became especially significant because Carro’s earlier ruling did not permanently reject Mangione’s double-jeopardy claim. Instead, he rejected it as premature under the circumstances existing at the time.
The distinction could now become crucial.
Mangione’s attorneys can return to Carro and argue that the condition that made their first motion premature has now occurred.
A State Trial Only Weeks Away
The timing raises the stakes considerably.
Jury selection in Mangione’s Manhattan murder trial is scheduled to begin Sept. 8, less than a month from Friday’s guilty plea.
Carro therefore may have to address the renewed dismissal effort quickly, or determine whether the state proceedings should be delayed while the issue is litigated.
And whichever side loses could attempt to seek appellate review.
That creates the possibility that Friday’s federal plea will do considerably more than eliminate Mangione’s January federal trial.
It could disrupt the Manhattan trial scheduled to begin in a matter of weeks.
The Question Carro Left Open Is Back
Friday’s developments bring the case almost directly back to the language of Carro’s September 2025 decision.
Then, double jeopardy was hypothetical.
Now Mangione has stood before a federal judge, admitted the killing and been convicted of two federal crimes based on the conduct surrounding Thompson’s death.
Whether those convictions legally prohibit New York from proceeding with its own murder prosecution is a substantially more complicated question than the familiar constitutional rule allowing separate sovereigns to prosecute the same conduct.
That question now belongs first to Carro.
And unlike the last time Mangione’s lawyers raised it, the judge can no longer dispose of the argument simply because nothing has happened in federal court.
Something has.
Luigi Mangione pleaded guilty.
And his lawyers wasted little time asking New York to end its case.
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