Luigi Mangione drops psychiatric defence ahead of Brian Thompson murder trial Mangione’s legal team has decided to withdraw plans to pursue a psychiatric defence in the high-profile murder case involving the killing of UnitedHealthcare Chief Executive Brian Thompson. The decision marks a significant shift in strategy just one day after his attorneys informed the court that they intended to argue that Mangione was experiencing an “extreme emotional disturbance” at the time of the fatal shooting.

The 28-year-old defendant has pleaded not guilty to all charges brought against him in both state and federal courts. He is accused of shooting Thompson in a deadly attack that took place in Midtown Manhattan in December 2024. Prosecutors allege that Thompson was shot from behind by a masked gunman while he was entering a Manhattan hotel to attend an annual investor conference.

Mangione’s lawyers were facing a June 18 deadline to submit evidence and documentation to prosecutors in the Manhattan District Attorney’s Office supporting their proposed psychiatric defence. However, before the deadline arrived, the defence team chose to abandon that legal argument, meaning the case will now proceed without claims that Mangione’s mental state should reduce his criminal responsibility.

Had the defence continued with the argument of extreme emotional disturbance and successfully convinced the jury, Mangione could have potentially received a reduced conviction. Under New York law, such a finding may have lowered the charge from murder to manslaughter, which carries a significantly shorter prison sentence compared to a murder conviction.

During a court appearance on Wednesday, the judge, Gregory Carro, discussed the psychiatric defence that Mangione’s attorneys had previously planned to present. The sudden reversal has attracted attention because it changes one of the key aspects of the defence’s earlier strategy.

Mangione’s next scheduled appearance in the state case is set for August 11, with his trial expected to begin on September 8. The proceedings are likely to draw considerable public and media attention due to the prominence of the victim and the unusual circumstances surrounding the case.

In addition to the state murder charges, Mangione is also facing separate federal charges, including allegations of stalking. The federal charges carry severe penalties, with a possible maximum sentence of life imprisonment if he is convicted.

The investigation into Thompson’s death began shortly after the shooting on December 4, 2024. Authorities launched a large-scale search for the suspect, eventually arresting Mangione days after the incident. Since then, the case has remained closely followed, with legal experts examining the strategies used by both the prosecution and the defence.

With the psychiatric defence now removed from the case, Mangione’s legal team will have to rely on other arguments as they prepare for the upcoming trial. The outcome of the proceedings could determine whether the former Ivy League graduate spends the rest of his life behind bars or receives a different legal judgment.

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