Demonstrators stand outside Manhattan federal court shortly after Luigi Mangione, the suspected killer of UnitedHealthcare CEO Brian Thompson, arrived for a hearing, Thursday, Dec. 19, 2024, in New York. (AP Photo/Seth Wenig)

Luigi Mangione, a suspect in the fatal shooting of UnitedHealthcare CEO Brian Thompson, is escorted off of a helicopter by police, Thursday, Dec. 19, 2024, in New York. (AP Photo/Pamela Smith)

Luigi Nicholas Mangione leaves at Blair County Courthouse in Hollidaysburg, Pa., Thursday, Dec. 19, 2024. (AP Photo/Gene J. Puskar, Pool)

Luigi Nicholas Mangione leaves at Blair County Courthouse in Hollidaysburg, Pa., Thursday, Dec. 19, 2024. (AP Photo/Gene J. Puskar, Pool)

Attorney Thomas M. Dickey, who represents Luigi Mangione, speaks to the media outside the Blair County Courthouse on Tuesday, Dec. 10, 2024, in Hollidaysburg, Pa. (Benjamin B. Braun/Pittsburgh Post-Gazette via AP)

Luigi Mangione, center, stands flanked by his attorneys Karen Agnifilo, left and Marc Agnifilo, right, during his initial court appearance in Manhattan federal court, Thursday, Dec. 19, 2024, in New York. (Elizabeth Williams via AP)

Luigi Nicholas Mangione leaves at Blair County Courthouse in Hollidaysburg, Pa., Thursday, Dec. 19, 2024. (AP Photo/Gene J. Puskar, Pool)

Luigi Mangione, a suspect in the fatal shooting of UnitedHealthcare CEO Brian Thompson, is escorted by police, Thursday, Dec. 19, 2024, in New York. (AP Photo/Pamela Smith)

Supporters of Luigi Nicholas Mangione, who is being charged with the murder of UnitedHealthcare CEO Brian Thompson, gather at the front of Blair County Courthouse for the suspect's preliminary and extradition hearing in Hollidaysburg, Pa., Thursday, Dec. 19, 2024. (Thomas Slusser/The Tribune-Democrat via AP)

Pennsylvania State Police Troopers, Altoona Police Department and Hollidaysburg Police Department officers stand guard outside of the Blair County Courthouse as a line forms for the preliminary and extradition hearing for Luigi Nicholas Mangione in Hollidaysburg, Pa., Thursday, Dec. 19, 2024. (Thomas Slusser/The Tribune-Democrat via AP)

Luigi Mangione, center, sits in court reading the federal complaint while wearing orange slip on shoes and his ankles shackled in Manhattan federal court, Thursday, Dec. 19, 2024, in New York. . He is flanked by his attorneys, Karen Agnifilo, left, and Marc Agnifilo. (Elizabeth Williams via AP)

Luigi Mangione, a suspect in the fatal shooting of UnitedHealthcare CEO Brian Thompson, is escorted by police, Thursday, Dec. 19, 2024, in New York. (AP Photo/Pamela Smith)

Luigi Mangione, a suspect in the fatal shooting of UnitedHealthcare CEO Brian Thompson, is escorted by police, Thursday, Dec. 19, 2024, in New York. (AP Photo/Pamela Smith)