Journal entries reveal Luigi Mangione's plan to assassinate UnitedHealthcare CEO, according to an affidavit.

The 26-year-old former Ivy Leaguer, Luigi Mangione, who is accused of abandoning a career in computer science to assassinate UnitedHealthcare CEO Brian Thompson, is facing mounting legal issues as state and federal prosecutors intensify the charges against him and disclose new evidence.

A federal criminal complaint alleges that Mangione kept a journal detailing his plan to murder a victim, mused about selecting a target, and congratulated himself on his research.

If Mangione is convicted in the new federal case, the possibility of the death penalty being reinstated arises.

"According to the affidavit, one entry states that the investor conference is a true windfall and the message becomes self-evident."

Allegedly, Mangione expressed a desire to "wack" an insurance CEO and was pleased that he had procrastinated, as it allowed him to gain more knowledge about UHC.

It is claimed that he wrote that he selected the insurance industry as his target because it met all the criteria.

On Dec. 4, outside a Hilton hotel in Manhattan, where UnitedHealthcare was hosting its annual shareholder conference, it is alleged that he shot Thompson in the back.

""We cannot ignore the radicalization happening in our country, as seen in the shooting of a young girl on a school campus, which is a continuation of our young people crying out for help. We have an obligation not only to make apprehensions after such incidents but to take proactive measures to prevent them," said NYC Mayor Eric Adams on Thursday after Mangione landed in Manhattan."

The document contains surveillance images that allegedly depict the suspect arriving and escaping the crime scene, the instant of the murder, and the suspected murder weapon and 3D-printed silencer.

Read the federal criminal complaint

The affidavit claims that Mangione wrote a letter to the Feds.

"I worked alone on this task, which involved basic CAD and a lot of patience."

Computer-aided design (CAD) is a tool used in design, while social engineering is a method hackers use to deceive individuals into revealing information unauthorized parties.

Mangione, who earned both a bachelor's and master's degree in computer science from the University of Pennsylvania, worked as a computer programmer before disappearing from his parents over the summer. He was later found in New York City in connection with the Thompson murder.

"To confirm that this is entirely self-funded, you can verify the serial numbers," the Feds letter stated. "I made my own ATM withdrawals."

During Mangione's arrest in Altoona, Pennsylvania, police allegedly found approximately $10,000 in cash. In court, he claimed it was not his.

Although his defense team contended that New York's first-degree murder charge, which involves a terrorism allegation, is an excessive reach, the federal charges extend even further.

"Karen Friedman Agnifilo, the defendant's New York attorney, stated to Planet Chronicle that the federal government's decision to add to an already overcharged first-degree murder and state terror case is highly unusual and raises serious constitutional and statutory double jeopardy concerns. "We are ready to fight these charges in whatever court they are brought," Agnifilo added."

The federal complaint mirrors the information provided by Manhattan prosecutors and the NYPD and presents a detailed sequence of events.

According to authorities, Mangione arrived at the Port Authority Bus Terminal in Manhattan at 10 p.m. on Nov. 24 and went to the Midtown Hilton hotel, where the murder took place. He then took a cab to a hostel on the Upper West Side.

During his time in New York, the suspect consistently wore a mask, even while indoors at the hostel.

On the day of the murder, December 4th, it is alleged that Mangione left the hostel at 5:35 a.m. with a gray backpack and rode an electric bike. The police tracked his route using multiple surveillance cameras from the Upper West Side to the Midtown Hilton.

At approximately 5:41 a.m., it is alleged that Mangione was spotted near the crime scene and made a purchase at a nearby coffee shop.

According to the affidavit, the Shooter was seen using a cellphone before the murder on at least one occasion.

At approximately 6:45 a.m., Thompson arrived outside the hotel. Mangione was reportedly waiting for nearly an hour. He was accused of shooting the victim and then fleeing on foot to West 55th Street. He got on an electric bike and rode north. He vanished into Central Park for an undetermined amount of time before emerging near West 77th Street and Central Park West, still riding the bike but without his gray backpack.

At approximately 6:58 a.m., he abandoned his bike and quickly flagged down a taxi, which transported him to the George Washington Bridge Bus Terminal in Upper Manhattan. A taxi camera captured an image of his masked face.

A gunman emerged from between two parked vehicles, approached Thompson from behind, and fired two shots, hitting him in the back and leg. It was known that Thompson would be present at an investor conference at 8 a.m. that morning.

"An FBI agent wrote in an affidavit that MANGIONE is the Shooter who killed the Victim on December 4, 2024. The agent also stated that various pieces of evidence, including the Notebook entries, the Feds Letter, the Shooter's surveillance of the Midtown Hotel on November 24 and December 4, 2024, and the Shooter's use of countersurveillance techniques and escape from New York City, all suggest that the Shooter undertook extensive efforts to identify the Victim, place the Victim under surveillance, and track the Victim's whereabouts in the time period leading up to the murder."

Manhattan DA Alvin Bragg is currently handling three of the most significant trials in the country: the Trump hush money case, Daniel Penny, and Mangione. However, Trump's newly appointed Attorney General and Manhattan U.S. Attorney will soon take over these cases.

"The federal government's decision to charge Mangione with a federal crime changes the game. Although New York does not have the death penalty, the feds may be trying to send a message to Mangione to take a plea and remove the death penalty from the table."

According to Paul Mauro, a former NYPD inspector, the Justice Department may be preparing to take over the case, anticipating that President-elect Donald Trump and the new DOJ leadership will assume office in January.

""Alvin Bragg's case will not survive, as a practical matter, and if anyone thinks a Donald Trump DOJ will take a back seat to his office, they have not been reading the news lately," he told Planet Chronicle Digital."

Manhattan prosecutors may ultimately decide to let the feds keep control of the state charges.

Mauro stated that Bragg's case may be brought up in the future, but the decision will have to be made on whether it is worth it at that time.

The condemnation of Mangione's online support has been issued by authorities in both New York and Pennsylvania, as he is accused of shooting a father of two from behind with a handgun and homemade silencer.

"NYPD Commissioner Jessica Tisch stated on Wednesday that Luigi Mangione has been formally charged and indicted for murder. She emphasized that in the two weeks since Mr. Thompson's death, there has been a disturbing and unacceptable celebration of cold-blooded murder on social media."

After arriving in New York, Mangione was escorted to a Manhattan federal court. His legal team remained silent following the proceedings.

"Friedman Agnifilo informed reporters that he respectfully declined to make any comment at this time. Mangione expressed gratitude for the support."