• Thompson's shooting on Wednesday sparked a massive manhunt but no arrests had been made in connection to the case before Monday.

Driving the news: Mangione was detained at a McDonald's in Altoona, Pennsylvania.

• The Altoona Police Department confirmed in a press release that Mangione was arrested on charges unrelated to Thompson's shooting.
• Mangione's last known address was in Honolulu, Hawaii. He was born and raised in Maryland and has ties to San Francisco.

Mangione's education and background

Mangione attended the University of Pennsylvania, graduating in May 2020 with both a bachelor's degree and a master's degree, a Penn spokesperson told Axios.

• He received a bachelor of science in engineering with a major in computer science and a minor in mathematics.
• He also received a master of science in engineering in computer and information science.

Mangione graduated in 2016 as valedictorian of the Gilman School, a prep school in Maryland, multiple media outlets reported.

• A LinkedIn account attributed to Mangione says he served as head counselor at a Stanford University pre-collegiate studies program in 2019. A Stanford spokesperson confirmed to Axios that "a person by the name of Luigi Mangione" had worked as head counselor for the program.
• The LinkedIn account says that Mangione started work as a data engineer after graduating Penn.
• A spokesperson for TrueCar, another company listed on Mangione's LinkedIn account, said he has not been an employee of the vehicle sales business since 2023.

How the manhunt unfolded

Context: Thompson was shot and killed outside of a midtown Manhattan Hilton about 6:40am ET on Wednesday by a masked man.

• Thompson had received threats, his wife said, possibly related to health care coverage.

Zoom in: A McDonald's employee who recognized Mangione called local police, New York City Police Commissioner Jessica Tisch said on Monday. Tisch said his behavior was suspicious during questioning.

• Mangione was carrying multiple fraudulent IDs, a U.S. passport, a gun and a suppressor consistent with those used in the attack.
• A fraudulent New Jersey ID was consistent with one used to check into a New York City hostel ahead of the shooting.

What they're saying: "Officers recovered a handwritten document that speaks to both his motivation and mindset," Tisch said. The document was three pages long.

• NYPD Chief of Detectives Joe Kenny said: "It does seem that he had some ill will toward corporate America."

What's next: NYPD officers and members of the Manhattan District Attorney's Office will interview Mangione further.

Go deeper:

• Person questioned in UnitedHealthcare CEO shooting, had "manifesto": reports
• Health care uproar sparks new legislation in Congress
• Corporate America gets more reclusive following CEO's killing

Editor's note: This story has been updated with details throughout.