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By Gabe Whisnant
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Luigi Mangione has abandoned plans to mount a psychiatric defense in his New York murder trial over the killing of UnitedHealthcare CEO Brian Thompson, reversing course just one day after announcing it in court.
The decision removes a potential pathway to reduce his liability from murder to manslaughter, significantly raising the stakes of the case. Mangione, who has pleaded not guilty, now faces a September state trial without that defense option, while prosecutors were awaiting supporting evidence tied to the claim.
In a letter to the judge, his attorney said the defense “respectfully withdraws” its notice under New York’s psychiatric defense statute after a transcript of a related sealed hearing was unsealed.
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Newsweek reached out to Mangione's legal representation via email on Thursday afternoon for comment.
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What May Be Behind Mangione’s Abrupt Defense Reversal
The reversal came as Mangione’s lawyers faced mounting pressure to turn over evidence supporting the psychiatric claim and fought a judge’s decision to unseal related court materials. His attorney, Karen Friedman Agnifilo, warned in court that making those details public would be “prejudicial to his defense to the exact same facts” in a parallel federal case, set for early 2027, where an extreme emotional disturbance defense is not permitted.
Mangione’s legal team was also up against a deadline to provide prosecutors with psychiatric records and other supporting evidence, raising the stakes of proceeding with the strategy.
“Nothing is going to be a surprise,” Judge Gregory Carro told Mangione’s lawyers Wednesday. “I’m not going to let you surprise the People on the eve of trial. So, get it done.”
Those disclosures could have extended beyond the state case, given the overlap in evidence between the two prosecutions.
Under New York law, the defense would have required Mangione to effectively concede that he killed Thompson while arguing mitigating circumstances—a strategy that can reduce a conviction to manslaughter but carries significant legal risk. As Randolph Rice, a Maryland-based attorney and legal analyst, told Fox News Digital, “from a practical standpoint, if you're standing in a state courtroom arguing that you shot someone because you were under extreme emotional distress, you may be handing federal prosecutors a significant admission that they can point to later.”
Taken together, the looming disclosure requirements and the risk of creating admissions usable in a separate federal trial appear to have driven the abrupt decision to abandon the defense.
“In essence, this defense is a, 'Yes I did it, but,' defense,” New York defense attorney Ron Kuby told Courthouse News Thursday, noting that any such state-court testimony or psychological files would immediately sabotage the subsequent federal trial. “And as a defense lawyer, I don't want Mangione saying, 'Yes, I did it.'"
How the Luigi Mangione Case Has Unfolded
Mangione is accused of fatally shooting Thompson on December 4, 2024, as Thompson walked to a Manhattan hotel hosting an investor conference. Prosecutors say a masked gunman approached from behind and opened fire, and investigators later linked the killing to writings referencing grievances with the health insurance industry.
Mangione, an Ivy League graduate from a wealthy Maryland family, was arrested five days later in Altoona, Pennsylvania, and has since pleaded not guilty to both state murder charges and separate federal stalking charges tied to the case.
In the months leading up to trial, his defense team pursued various legal strategies, including challenging key evidence such as a gun and a notebook that prosecutors say connect him to the killing. A judge ultimately ruled that those items could be introduced at trial, strengthening the prosecution’s case.
On Wednesday, Mangione’s lawyers signaled they would pursue an “extreme emotional disturbance” defense, which could have reduced a murder conviction to manslaughter. But after a court dispute over turning over psychiatric evidence and unsealing related materials, the defense abruptly withdrew that strategy, leaving Mangione to face trial without it.
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