Mangione was hit with four federal charges Thursday, 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.
The federal complaint contains previously unreleased excerpts from the notebook that police said they seized from Mangione.
ET on ABC looks at the murder of UnitedHealthcare CEO Brian Thompson and the manhunt that led to the arrest of Luigi Mangione, who went from the Ivy League to alleged killer.
Luigi Mangione, a suspect in the fatal shooting of UnitedHealthcare CEO Brian Thompson, is escorted by police, Dec. 19, 2024, in New York City.
Luigi Nicholas Mangione leaves the Blair County Courthouse, Dec. 19, 2024, in Hollidaysburg, Pa. Gene J. Puskar/POOL/AFP via Getty Images.
A Manhattan grand jury upgraded charges against Mangione to include first-degree murder in furtherance of terrorism, prosecutors announced Tuesday.
In Pennsylvania, where Mangione was arrested on Dec. 9 after nearly a week on the run, he faces charges including allegedly possessing an untraceable ghost gun. »