Luigi Mangione, a Maryland native, was arrested Monday in Pennsylvania and charged with murder in New York in the shooting death of UnitedHealthcare CEO Brian Thompson, authorities said.

The Mangione name is well known in Baltimore County political and civic circles. Luigi, 26, was a graduate of one of the region’s best-known private schools. Here’s what we know:

He was valedictorian at the prestigious Gilman School

Mangione graduated at the top of his class in 2016 at the all-boys, private school in Roland Park, known as the alma mater for decades’ of Maryland governors, senators and scions. He spoke at the Gilman Founders Day celebration in 2016, where he highlighted shared class experiences like the school play and football rivalries. He also said: “Even early on, the class of 2016 was challenging the world around it.”

[Live updates: New details emerge about Mangione’s Baltimore ties]

Gilman Head of School Henry P.A. Smyth said they don’t have any information beyond what’s being reported in the news and called the situation “deeply distressing.”

He graduated from the University of Pennsylvania

Mangione studied engineering at the University of Pennsylvania and joined a fraternity. Penn Today, the university’s news blog, featured him in a story for starting a club that developed video games. The club eventually grew to 60 members, according to the article.

”In high school, I started playing a lot of independent games and stuff like that, but I wanted to make my own game, and so I learned how to code,” Mangione, a junior at the time, said. “In my freshman and sophomore years of high school, I learned [on my own] how to program, and that’s why I’m a computer science major now; that’s how I got into it.”

Mangione interned as a programmer for the Maryland-based Firaxis Games from 2016 to 2017, according to his LinkedIn profile. A spokesman for Take-Two Interactive Software, the company that acquired Firaxis in 2005, said it does not comment on former employees “as a practice.”

His social media posts also suggest that he belonged to the fraternity Phi Kappa Psi. They also show him taking part in a 2019 program at Stanford University, and in photos with family and friends in Hawaii, San Diego, Puerto Rico, the New Jersey shore and other destinations.

His large Italian family is well-connected in politics, business and philanthropy

The Mangione family has many real estate holdings, including Turf Valley Country Club, Hayfields Country Club, and numerous nursing homes. They have been active philanthropists, donating to the Walters Art Museum and Greater Baltimore Medical Center.

Several family members are listed as owners of WCBM radio, a conservative talk show station that operates as 680 AM, according to a 2023 FCC biennial licensing document.

His cousin, Del. Nino Mangione, represents the Lutherville area in the Maryland General Assembly. A conservative Republican, Nino Mangione has been speaking out against the Maryland Pipeline Reliability Project, which will impact landowners in his district. Nino Mangione recently announced plans to run for the Baltimore County Council.

His family no longer lives at the Towson home where he grew up

News reporters descended on the Towson street where Mangione grew up. Mangione’s parents sold the home a year ago.

The family that moved in posted a note that read: “We purchased this home in June. We do not know the Mangione family, have no relations with them, do not know how to contact them, have never met them, wouldn’t know them if we ran into them.” Neighbors couldn’t say where the Mangione family had moved.

One neighbor, Alison Mitchell, described his parents as “lovely people” whose children had all left for college by the time her family purchased their home in 2017. Police blocked the entrance to Hayfields Country Club, where a woman who worked there said she had no comment.

He was arrested in Pennsylvania with a ghost gun and three-page document

NYPD Chief of Detectives Joseph Kenny said the handwritten, three-page document found with Luigi Mangione at the Altoona McDonald’s where he was arrested made it seem as though he had “ill will” toward corporate America.

Kenny also said that Mangione was in possession of a “ghost gun” and a suppressor. The NYPD said they believe the person of interest was acting alone, but the investigation is ongoing.

Late Monday, prosecutors in New York filed murder charges against Mangione.

Baltimore Banner reporters Danny Nguyen, Dylan Segelbaum, Ellie Wolfe, Justin Fenton, Hallie Miller, Pamela Wood, Cody Boteler, Julie Scharper and Tim Prudente contributed to this report.