Mangione pleads not guilty to federal murder charges

Luigi Mangione has pleaded not guilty to federal charges of fatally shooting health insurance executive Brian Thompson, a day after prosecutors formally stated their intent to seek the death penalty.

Mr Mangione, 26, previously pleaded not guilty to a separate set of New York state charges over the 4 December killing of Mr Thompson, the former CEO of UnitedHealth insurance unit.

He entered the plea at an arraignment before US District Judge Margaret Garnett.

The brazen shooting of Mr Thompson outside a midtown Manhattan hotel, where the company had gathered for an investor conference, and the ensuing five-day manhunt, captivated Americans.

Authorities say the words "deny," "delay," and "depose" - a phrase that echoes tactics some accuse health insurers of using to avoid paying out claims - were found written on shell casings at the crime scene.

While public officials condemned the killing, some Americans have cheered Mr Mangione, saying he drew attention to steep US healthcare costs and the power of health insurers to refuse payment for some treatments.

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In justifying their decision to seek the death penalty, prosecutors wrote in a court filing that Mr Mangione "presents a future danger because he expressed an intent to target an entire industry, and rally political and social opposition to that industry, by engaging in an act of lethal violence."

Earlier this month US Attorney General Pam Bondi announced that the Justice Department would seek the death penalty for Mr Mangione.

Last night's court filing by the Manhattan US Attorney's office formalised prosecutors' intent.

Mr Mangione's lawyers have said Ms Bondi's 1 April announcement was "unapologetically political" and breached government protocols for death penalty decisions.

If Mr Mangione is convicted in the federal case, the jury would determine in a separate phase of the trial whether to recommend the death penalty.

Any such recommendation must be unanimous, and the judge would be required to impose it.

Mr Mangione is currently being held in federal prison in Brooklyn.