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Suspected assassin Luigi Mangione returned to a New York criminal court Friday for a hearing in connection with state murder and terrorism charges in a sprawling case surrounding the assassination-style murder of UnitedHealthcare CEO Brian Thompson in Manhattan.

The suspected killer arrived at 2:24 p.m. wearing a bulletproof vest and green sweater. He appeared tired but clean-cut.

Assistant District Attorney Zachary Kaplan said prosecutors were supplying 800 GB worth of files in discovery, including surveillance video, raw data from the medical examiner, forensic testing results, and phone data.

Defense attorney Karen Friedman Agnifilo objected to motion deadlines, noting her client is facing three separate criminal cases. She also alleged misconduct on behalf of police in Altoona, Pennsylvania, whom she said may have violated Mangione’s constitutional rights, and said she was shocked that a recent HBO documentary contained interviews with New York City Mayor Eric Adams and the NYPD's chief of detectives.

LUIGI MANGIONE SUPPORTERS WHINE ABOUT SUSPECTED CEO ASSASSIN'S PORTRAYAL IN ‘CORPORATE BACKED NARRATIVE’

Luigi Mangione arrives at court

Luigi Mangione, the suspect in the killing of UnitedHealth Group chief executive Brian Thompson, arrives for a hearing in Manhattan Criminal Court on New York state murder and terrorism charges in New York City, U.S., February 21, 2025.  (REUTERS/Jeenah Moon)

The hearing lasted about 10 minutes before authorities escorted Mangione out of the courtroom.

"I understand the NYPD’s need for a press conference," Agnifilo told reporters outside the courthouse. "I didn’t understand how this week on HBO I see NYPD in makeup talking about evidence in the case that we had not received."

Supporters of Luigi Mangione stand outside of a NYC court

Supporters of Luigi Mangione gather outside the Criminal Court following the status hearing on Friday, Feb. 21, 2025. Magnione is accused of killing UnitedHealthcare CEO Brian Thompson outside of a Manhattan hotel last year. (Rashid Umar Abbasi for Fox News Digital)

She also raised concerns about potential constitutional issues with his arrest in Altoona, Pennsylvania, alleging that only one police officer had their bodycam turned on and that there may be problems with the search and seizure.

As she spoke outside, a group of protesters chanted in support of the suspected killer: "We, the people, want Luigi free."

Supporters of Luigi Mangione stand outside of a NYC court

Supporters of Luigi Mangione gather outside the Criminal Court following the status hearing on Friday, Feb. 21, 2025. Magnione is accused of killing UnitedHealthcare CEO Brian Thompson outside of a Manhattan hotel last year. (Rashid Umar Abbasi for Fox News Digital)

Supporters had urged one another to wear green in his honor, like the "Luigi" character in Nintendo’s "Super Mario" video games. A handful of people in the courthouse donned the color or other symbols of support, like a scarf that read "Free Luigi."

The 26-year-old former Ivy Leaguer is accused of stalking Thompson, a married father of two, and shooting him in the back outside a shareholder conference in early December, in an alleged attack that investigators have painted as cold-blooded and premeditated.

Surveillance footage still shows the suspect in the shooting death of the CEO of United Healthcare was shot to death in what looks to be a targeted attack.

A surveillance image released by the NYPD shows the suspect in the shooting death of United Healthcare CEO, Brian Thompson on Wednesday, December 4, 2024. The suspect can be seen approaching Thompson from behind and shooting him multiple times before walking away from the scene. (NYPD Crimestoppers)

Many of his defenders have been quick to note he is considered innocent until proven guilty in the eyes of the law. But his significant support is prompting concerns of potential jury nullification — when jurors deliver a verdict based on ideology rather than the law.

"Jury selection is going to be critical in Mangione’s case," said Edwina Elcox, a Boise-based defense attorney whose former clients have included the so-called "Cult Mom" Lori Vallow. "He is viewed as a modern-day Robin Hood."

Donations to his legal defense fund have surpassed $500,000 — racking in more than $200,000 over the past 10 days, when supporters touted nearing the $300,000 milestone with the help of more than 10,000 donors. Some proponents have even described him as a "humanitarian."

Brian Thompson in a blue button down shirt and blue zip-up smiles for the camera

UnitedHealthcare CEO Brian Thompson was killed in New York on Dec. 4. (AP Photo/UnitedHealth Group)

"It’s a fascinating case," Elcox told Fox News Digital. "The CEO was a terribly unsympathetic figurehead of a company that has droves of horror stories about how [it] treated people who desperately needed various medical interventions — juxtaposed against handsome, educated, talented young man with no criminal history." 

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Luigi Mangione appears in Manhattan Supreme Court in New York City

Luigi Mangione appears in Manhattan Supreme Court in New York City on December 23, 2024. Mangione is facing murder charges for allegedly shooting UnitedHealthcare CEO Brian Thompson. (Curtis Means for DailyMail/Pool)

While both sides will likely focus heavily on voir dire, there's still strong evidence in the case, said Paul Mauro, a retired NYPD inspector.

"Jury nullification could always be an issue, especially with how this kid has come to encapsulate so many progressive gripes against corporations and the insurance industry, but I don’t think even Manhattan criminal justice has been that completely defanged," he told Fox News Digital. "Yes, this is the venue that got us Alvin Bragg, but this is also the venue in which 12 ordinary New Yorkers acquitted Daniel Penny."

Supporters of Luigi Mangione stand outside of a NYC courtroom

Supporters of Luigi Mangione, the suspect in the killing of UnitedHealth Group chief executive Brian Thompson, gather at a corridor, on the day Mangione is expected to attend a hearing in Manhattan Criminal Court on New York state murder and terrorism charges in New York City, U.S., February 21, 2025.  (REUTERS/Jeenah Moon)

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The case looks "very strong" at this stage, he said, and he expects jurors to weigh evidence responsibly.

"And anyone who thinks jury nullification is a good idea, I would only remind them that there is a federal death penalty case against Mangione lurking behind Bragg’s case, should the feds need to bring it," he added.

Mangione faces three separate criminal proceedings, in New York, Pennsylvania, and federal court.

Supporters of Luigi Mangione stand outside of a NYC court

Supporters of Luigi Mangione gather outside the Criminal Court following the status hearing on Friday, Feb. 21, 2025. Magnione is accused of killing UnitedHealthcare CEO Brian Thompson outside of a Manhattan hotel last year. (Rashid Umar Abbasi for Fox News Digital)

UNITEDHEALTHCARE CEO MURDER SUSPECT LUIGI MANGIONE INDICTED IN NEW YORK

The slaying has been politically charged from the start — after police revealed that they recovered bullet casings at the scene with handwritten messages on them: "defend," "depose" and "deny."

Those words are eerily similar to the title of a book that is highly critical of Thompson's health insurance industry, "Delay, Deny, Defend: Why Insurance Companies Don't Pay Claims and What You Can Do About It," written by Jay Feinman and published in 2010.

WATCH ‘DENY, DEFEND, DELAY: THE MURDER OF A CEO’ ON FOX NATION

A screenshot from surveillance footage released by the NYPD shows an alleged person of interest wanted in connection for the shooting death of UnitedHealthcare CEO Brian Thompson

A screenshot from surveillance footage released by the NYPD shows an alleged person of interest wanted in connection to the shooting death of UnitedHealthcare CEO Brian Thompson in Midtown Manhattan on Wednesday, December 4, 2024. (NYPD Crime Stoppers )

Mangione has a degree from the Ivy League University of Pennsylvania and attended an elite private high school in Baltimore. Despite some supporters' characterization of him as an anti-capitalist crusader, he allegedly stopped at a New York City Starbucks for coffee minutes before the murder and was ultimately arrested eating hashbrowns at a McDonald's in Altoona.

Mangione, who police allege kept a journal about the crime, is accused of "meticulously" planning the murder with the motive of igniting a "public discussion about the healthcare industry," according to the Justice Department.

mangione eating a mcdonalds hashbrown with mask hanging from one ear

UnitedHealthcare CEO slaying suspect Luigi Mangione pictured at a McDonald's in Altoona, Pennsylvania, on Monday, Dec. 9, 2024. (Pennsylvania State Police)

SUSPECTED UNITEDHEALTHCARE ASSASSIN LUIGI MANGIONE'S PLAN TO ‘WACK’ CEO REVEALED IN JOURNAL ENTRIES: AFFIDAVIT

Federal prosecutors allege he stalked the victim, arrived in New York City a week in advance and scouted his surroundings. Police allegedly found his DNA and fingerprints near the crime scene and say he had a gun linked to the murder in his backpack when he was arrested days later.

The NYPD released a still image from surveillance video, showing him pulling his coronavirus mask down and smiling while flirting with a clerk at the check-in of the Manhattan hostel where police say he stayed for the murder. It went viral and immediately attracted a wave of support online for the accused killer.

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Luigi Mangione

Luigi Mangione shouts while officers restrain him as he arrives for his extradition hearing at Blair County Courthouse in Hollidaysburg, Pennsylvania on Tuesday, December 10, 2024. (David Dee Delgado for Fox News Digital)

Police said they allegedly recovered the suspected murder weapon, a 3D-printed suppressor and the same fake ID used to check into the New York hostel upon Mangione's arrest. 

The group behind his defense fundraiser, the self-titled December 4 Legal Committee, describes itself as "a team of 15 volunteers around the United States" that was "created independently by Mangione's supporters on his behalf." Two of its spokespersons, Sam Beard and Jamie Peck, also host a podcast "about communism and gossip" called "Party Girls."

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A Monday hearing in the Pennsylvania case has been postponed as he awaits trial on more serious charges in New York and in federal court, which could result in a sentence of life in prison without parole or death, respectively. 

Fox News' Audrey Conklin and Kirill Clark contributed to this report.