Luigi Mangione's Defense Will Argue He Was Suffering 'Extreme Emotional Disturbance'

Luigi Mangione's lawyers have a new strategy. They're going to argue he was experiencing "extreme emotional disturbance" when he allegedly shot and killed UnitedHealthcare CEO Brian Thompson outside a Midtown Manhattan hotel back in December 2024.

A judge revealed the plan in court Tuesday. Acting New York Supreme Court Justice Gregory Carro said he'll unseal records connected to this psychiatric defense. Mangione's attorney, Karen Friedman Agnifilo, pushed back, arguing that unsealing those records could mess with the separate federal case against her client. The judge also dismissed a charge related to possessing a large capacity ammunition magazine.

This comes on the heels of a May ruling where the judge tossed out evidence from an initial search of Mangione's backpack — a magazine, his cell phone, passport, wallet. But evidence from a second search stays in play. That includes the gun and a red notebook prosecutors say has diary entries laying out Mangione's thinking before the shooting. His New York trial starts in September.

What Happened That Morning

Brian Thompson was 50. He was the CEO of UnitedHealthcare. He got shot and killed early on December 4, 2024, outside the New York Hilton Midtown, where he was heading into the company's investor conference.

According to the indictment, the shooter came up behind him around 6:45 a.m. and fired twice with a 9mm handgun fitted with a homemade silencer. One shot hit his back. One hit his leg. The shell casings left behind had words scratched into them — "delay," "deny," "depose." Words a lot of people instantly connected to how health insurers handle claims. Mangione was arrested five days later at a McDonald's in Pennsylvania.

What His Own Writings Say About Why

Prosecutors say they don't have to guess at a motive. Mangione apparently wrote it down himself.

Police recovered a red spiral notebook on him at the time of his arrest. In it, prosecutors say, he described the health insurance industry as something that "extracts human life force for money" and wrote that he wanted to "prove a political point" against it. He picked UnitedHealthcare specifically not over any personal dispute — he reportedly wasn't even insured by them — but because it was simply the largest insurer in the country and an easy symbol for the industry as a whole.

The notebook reads like someone who thought this through. He apparently weighed bombing a corporate headquarters and rejected it, writing "Bombs=terrorism" and reasoning it would risk hurting people who had nothing to do with the issue. Killing one executive at an investor conference, he wrote, was "targeted and precise and doesn't risk innocents." He also left a note saying he acted entirely alone, apologizing for "any strife or trauma" while adding that "it had to be done... these parasites simply had it coming."

There's another piece of this that's gotten a lot of attention too. Mangione reportedly went through a serious back injury in 2023 that led to spinal surgery, and people who knew him have described him as deeply frustrated with his own experience navigating the healthcare system while in chronic pain. Whether that personal struggle is what tipped him toward the ideology in the notebook, or whether the two things are separate, is exactly the kind of question his new legal strategy is built around.

What 'Extreme Emotional Disturbance' Actually Means

This isn't an insanity defense. Under New York law it's an affirmative defense that, if it works, doesn't lead to acquittal — it knocks the charge down from murder to manslaughter. His lawyers have to show he was acting under an extreme emotional disturbance with a reasonable explanation, based on how he was experiencing things at the time.

That's a much narrower argument than "I didn't do it" or "I didn't know right from wrong." It's about how the law should categorize what he's responsible for. And it puts his defense in an odd position — leaning on his health struggles and psychological state as the explanation, while prosecutors point right back at that same notebook as proof this wasn't an emotional break at all, but something planned out in detail over time.

A Case That's Become Bigger Than a Trial

After Mangione's arrest, support for him exploded online. #FreeLuigi got shared tens of thousands of times. A "Free Luigi" billboard went up in California. A December 2024 NORC poll found most American adults thought health insurers bore real responsibility for Thompson's death, pointing to coverage denials and company profits.

That reaction sparked its own backlash. Pennsylvania Governor Josh Shapiro called parts of the online response "deeply disturbing." Trump, then president-elect, called celebrating Mangione "a sickness."

Almost two years later, this is still one of the most watched trials in the country — not just for what happens to Mangione, but for what the whole thing has come to represent about anger, healthcare, and who people decide to root for.

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