Luigi Mangione to assert psychiatric defense in UnitedHealthcare CEO murder trial; judge to unseal mental health records

Psychiatric defense revealed

Luigi Mangione will mount a psychiatric defense at his New York state murder trial, Judge Gregory Carro disclosed in court on Wednesday. Mangione's lawyers plan to argue that he was in a state of "extreme emotional disturbance" when he killed UnitedHealthcare chief executive Brian Thompson on 4 December 2024. If the jury accepts that argument, the highest conviction possible would be manslaughter rather than murder, which could send Mangione to a psychiatric facility instead of prison.

Mangione's lawyers have informed him they will attempt to show that he was suffering from extreme emotional disturbance at the time of the occurrence.

The judge also announced that records from a secret 3 June hearing about the psychiatric defense will be made public. Mangione sat in court in a blue suit and a light-coloured shirt. His state trial is scheduled for 8 September; a separate federal trial on stalking charges begins on 13 October.

The December 2024 killing

Brian Thompson, 50, was shot from behind as he walked to a Manhattan hotel for UnitedHealth Group's annual investor conference. Surveillance footage showed a masked gunman firing a handgun fitted with a silencer. Police recovered ammunition bearing the words "delay," "deny" and "depose", a phrase used by critics to describe how insurers avoid paying claims.

Mangione, an Ivy League graduate from a Maryland family, was arrested five days later at a McDonald's in Altoona, Pennsylvania, roughly 370 kilometres west of Manhattan. He has pleaded not guilty to state and federal charges and could face life in prison if convicted.

Pretrial proceedings and evidence

At a May 18 hearing, Judge Carro ruled that a 3D-printed pistol and a notebook found on Mangione could be used as evidence. Prosecutors say the gun matches the one used in the killing. The notebook allegedly includes a wish to "wack" a health insurance executive and a call to rebel against what it calls a "greed fueled health insurance cartel."

A closed-door proceeding on 3 June, held despite media objections, centred on the psychiatric defense. Mangione missed his scheduled Tuesday court appearance this week because prosecutors failed to inform the jail of the hearing. Prosecutor Joel Seidemann acknowledged the error: "It's on us."

Timeline of key events

The sequence stretches from the shooting to the approaching trials, with the psychiatric defense now formally on the record.