Mangione would face lighter sentencing if jury accepts he was in a state of ‘extreme emotional disturbance’ during act.

Luigi Mangione, the man suspected of fatally shooting United Healthcare CEO Brian Thompson in New York City, will argue a psychiatric defence during his trial.

Judge Gregory Carro said on Wednesday that Mangione’s lawyers informed him that they will assert that their client was in a state of “extreme emotional disturbance” when he allegedly carried out the shooting in December 2024.

New York state allows murder defendants to make the case that they cannot be held fully responsible for their actions because they were in a state of extreme emotional disturbance at the time of the killing.

Thompson’s slaying, which took place outside a hotel in midtown Manhattan, shocked the United States public. Grainy footage of the act quickly spread across social media.

It also drew attention to the widespread anger over sky-high healthcare prices. Police have said that the terms “delay”, “deny”, and “depose” were written on the suspect’s ammunition, a reference to how health insurance companies avoid paying claims.

If the jury concludes that Mangione was emotionally disturbed at the time of the alleged act, it could move to convict him of manslaughter rather than murder. Such a conviction generally results in a lighter sentence.

Relying on a claim of emotional disturbance means that Mangione would effectively admit that he carried out the act, but that he did so under circumstances of impaired judgement. It differs from an insanity plea, which would allow Mangione to serve his sentence in a psychiatric facility rather than a prison.

Mangione, who sat between two of his lawyers dressed in a blue suit, is set to go to state trial on September 8. The 28-year-old has previously pleaded not guilty to state and federal charges in connection to the killing.

His federal trial, which includes stalking charges, is set to begin on October 13. He faces a potential life in prison if convicted in either case.

US District Judge Margaret Garnett, who is overseeing the federal case, threw out murder and weapons charges against Mangione on technical grounds in January. That ruling eliminated the possibility of Mangione facing the death penalty.