Mangione faces 11 state charges, including first-degree murder in furtherance of terrorism.
State prosecutors allege Mangione was found in possession of what is believed to be the murder weapon, and surveillance videos show a man matching his description before and after the attack, including outside the Hilton where Thompson was shot in the back.
Mangione, 26, is being held at the Metropolitan Detention Center in Brooklyn after he appeared in federal court last week.
What happened during Luigi Mangione's court appearance
Mangione entered court with his hands and feet shackled. He was wearing a burgundy sweater over a white collared shirt and khaki pants.
Luigie Mangione is escorted into Manhattan Criminal court for his arraignment in the killing of UnitedHealthcare CEO Brian Thompson, Monday, Dec. 23, 2024, in New York. Seth Wenig / APHe spoke quietly and extensively with his attorneys during his brief court appearance. HIs hands were unshackled long enough for him to sign some papers. He appeared to be listening intently as his attorney spoke to the judge.
Prosecutors said in court they have been assured by federal prosecutors that the state case will move forward prior to the federal trial.
Friedman Agnifilo said Mangione is facing two proceedings, one of them with the possibility of the death penalty, and she told the court she's "very concerned" about Mangione's ability to get a fair trial, saying statements made by government officials have been prejudicial.
Friedman Agnifilo also took issue with Mayor Eric Adams' presence when Mangione was returned to New York, saying it was "political."
Bail was set at $1, but that is purely symbolic, because he is already being held in federal prison.
As Mangione left court, some of the women in attendance gave him a thumb's up.
Adams responds to Mangione's lawyer and supporters
"The cold-blooded assassination of Brian Thompson -- a father of two -- and the terror it infused on the streets of New York City for days has since been sickeningly glorified, shining a spotlight on the darkest corners of the internet. Mayor Adams' priority is -- and always has been -- public safety, and he has repeatedly spoken about how social media is fueling the radicalization of our youth. Critics can say all they want, but showing up to support our law enforcement and sending the message to New Yorkers that violence and vitriol have no place in our city is who Mayor Eric Adams is to his core," Adams spokesperson Kayla Mamelak Altus said.
Mangione facing both state and federal charges
In a statement, Friedman Agnifilo called the federal charges "highly unusual," saying they raise "serious constitutional and statutory double jeopardy concerns."
Manhattan District Attorney Alvin Bragg says his office is working with the federal government and, while the cases are happening simultaneously, the trials will have to happen at different times. Acting U.S. Attorney Edward Kim said he expects the state case to proceed first.
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