Federal prosecutors on Thursday submitted notice they intend to seek the death penalty if Luigi Mangione is convicted of killing United Healthcare CEO Brian Thompson.

Luigi Mangione pleaded not guilty to federal charges accusing him of stalking and murdering UnitedHealthcare CEO Brian Thompson.

Luigi Mangione is accused of stalking UnitedHealthcare CEO Brian Thompson and shooting him to death on Dec. 4, 2024.

Luigi Mangione pleaded not guilty to a four-count indictment charging him in the murder of UnitedHealthcare CEO Brian Thompson during his arraignment in New York federal court on Friday.

Luigi Mangione is charged with stalking United Healthcare chief Brian Thompson outside the Hilton in Midtown and then shooting him to death on a Manhattan street.

Attorney General Pam Bondi has already signaled her intention to pursue the death penalty in the case, which Luigi Mangione's lawyers are actively trying to stop.

A jury in NY returned a four-count indictment against alleged CEO killer Luigi Mangione. He has been charged with two counts of stalking, a firearms offense and murder through the use of a firearm.

ABC News' Stephanie Ramos speaks with civil rights attorney Areva Martin on the federal indictment of alleged CEO assassin Luigi Mangione and the stated intention to pursue the death penalty.

Luigi Mangione asked a federal judge in New York on Friday to stop the government from seeking the death penalty if he’s convicted of federal charges.

Attorneys for Luigi Mangione are asking a judge to take the death penalty off the table at his federal murder trial. They said the attorney general's call for capital punishment is a political stunt.

Attorney General Pam Bondi publicly announced she wants Mangione, the suspect in the killing of UnitedHealth Group chief executive Brian Thompson, executed if found guilty on federal charges.

Attorney General Pam Bondi is directing federal prosecutors to seek the death penalty for Luigi Mangione if he is convicted of the December murder of UnitedHealthcare CEO Brian Thompson.

Attorney General Pam Bondi is directing federal prosecutors to seek the death penalty for Luigi Mangione if he is convicted of the murder of CEO Brian Thompson.

Attorney General Pam Bondi is directing federal prosecutors to seek the death penalty for Luigi Mangione if he is convicted of the murder of CEO Brian Thompson.

ABC News investigative correspondent Aaron Katersky shares the latest on the Luigi Mangione trial.

Luigi Mangione violated the "special treatment" he was afforded for his last court appearance when handwritten notes were secreted inside a pair of argyle socks, New York prosecutors claim.

Luigi Mangione violated the "special treatment" he was afforded for his last court appearance when handwritten notes were secreted inside a pair of argyle socks.

Prosecutors in the murder case of United Healthcare CEO Brian Thompson say heart-shaped notes were smuggled to suspect Luigi Mangione in a package of socks.

Luigi Mangione violated the "special treatment" he was afforded for his last court appearance when handwritten notes were secreted inside a pair of argyle socks.

A defense attorney for Luigi Mangione, the man charged with killing the CEO of UnitedHealthcare, insists a police search and arrest late last year were illegal.

A defense attorney for Luigi Mangione, charged with killing the CEO of UnitedHealthCare in New York City, says the police search and Mangione's arrest at a Pennsylvania McDonald's was illegal.

Accused United Healthcare CEO killer Luigi Mangione appeared in court on Friday, but no date was set for his trial.

Supporters of the accused UnitedHealthcare CEO killer gathered outside the Manhattan courthouse.

Alleged UnitedHealthcare CEO killer Luigi Mangione returned to a New York City courtroom on Friday for a brief appearance in his state murder case.

Luigi Mangione appeared in a New York City court today. He faces state and federal charges for allegedly shooting Brian Thompson, the CEO of United Health Care.

The afternoon appearance in Manhattan's State Supreme Court marks Mangione's first hearing since his arraignment on the state charges in late December 2024.

ABC News correspondent Trevor Ault shares the latest after Luigi Mangione is expected to appear in court as he faces charges for allegedly killing United Health Care CEO Brian Thompson.

The 26-year-old is expected to be in court for the first time since being charged with the murder of UnitedHealthcare CEO Brian Thompson outside a Manhattan hotel in December.

The accused killer of United Healthcare CEO Brian Thompson said he’s “overwhelmed by and grateful for” everyone who has expressed support for him.

Luigi Mangione, the accused killer of UnitedHealthCare CEO Brian Thompson, is speaking out from behind bars ahead of his next court appearance.

The accused killer has received more than $300,000 in donations as he fights murder charges in the shooting death of UnitedHealthcare CEO Brian Thompson.

Donations to Luigi Mangione’s legal defense fund have picked up after a news report that they had slowed down.

The firearm found on the suspect in the murder of the UnitedHealthcare CEO is believed to have been an untraceable ghost gun, according to police.

Luigi Mangione's defense team adds death penalty expert.

Supporters of Luigi Mangione are raising tens of thousands of dollars for his defense fund.

Luigi Mangione appeared in court on Monday in shackles and under heavy guard to plead not guilty in the murder of UnitedHealthcare CEO Brian Thompson.

Luigi Mangione appeared Monday morning before Judge Gregory Carro. The arraignment is in regard to 11 charges filed against him in the state of New York.

The alleged killer of UnitedHealthcare CEO Brian Thompson was extradited from Pennsylvania to New York City.

Protesters from all walks of life assembled outside the courthouse to show their support for Luigi Mangione

Mangione appeared on Monday in a Manhattan court for his arraignment on state murder and terror charges in the fatal shooting of UnitedHealthcare CEO Brian Thompson.

As investigators continue probing the United Healthcare CEO killing, there is concern among about the long-term impacts the public assassination could cause.

Luigi Mangione is due in a New York state court, where he will face charges in an 11-count indictment accusing him of murdering UnitedHealthcare CEO Brian Thompson “in furtherance of terrorism.”

ABC News’ Aaron Katersky and legal contributor Brian Buckmire discuss the court appearance for the suspect charged in the fatal shooting of UnitedHealthcare CEO Brian Thompson.

Luigi Mangione waived extradition on Thursday and was transported from Pennsylvania to New York.

Luigi Mangione is expected to face New York State murder and terrorism charges on Monday in a Manhattan court room.

Luigi Mangione, the man accused of gunning down UnitedHealthcare CEO Brian Thompson, is charged in a four-count federal criminal complaint.

The 26-year-old accused of shooting UnitedHealthcare CEO Brian Thompson arrived from Pennsylvania on Thursday. Mangione, who could now face the death penalty, has become an unlikely hero to some.

ABC News’ Linsey Davis speaks to criminal defense attorney Arthur Aidala on the criminal complaint filed today against Luigi Mangione and what happens next in the high-profile case.

Prosecutors laid out evidence against the 26-year-old accused in UnitedHealthcare CEO Brian Thompson's fatal shooting, after he arrived from Pennsylvania on Thursday. Mangione has not entered a plea.

Luigi Mangione faces four federal charges, including stalking, a firearms offense involving a silencer and murder through use of a firearm, a charge that makes him eligible for the death penalty.