As authorities in New York aim to extradite 26-year-old Luigi Mangione from Pennsylvania regarding the shooting death of UnitedHealthcare CEO Brian Thompson on December 4 outside a hotel in Manhattan, investigations into the suspect’s background are ongoing.

<pMangione’s attorney, Thomas Dickey, has indicated that his client intends to plead not guilty to the charges against him.

Originating from a well-known family in Maryland and a graduate of the University of Pennsylvania, Mangione had expressed struggles with back pain and was discovered to have written materials that exhibited resentment towards corporate America, according to police reports.

Here’s a summary of significant events in Mangione’s evolving story.

2016: An Accomplished Graduate

Raised near Baltimore, Mangione comes from a distinguished family; his late grandfather, Nicholas Mangione Sr., built the family legacy through real estate developments, including a large golf club and resort, and ownership of various hotels and nursing homes, as noted in his FamilySearch.org obituary.

Among his relatives is Nino Mangione, a member of the Maryland House of Delegates.

In 2016, Luigi Mangione graduated from the esteemed Gilman School, a prestigious K-12 institution in North Baltimore, where he delivered a valedictory address that emphasized bravery and the importance of being unique.

2018: Confronting Lyme Disease and Other Challenges

In July 2018, Mangione took to social media to discuss various health problems, including difficulties with restful sleep.

The following month, he shared in an online forum about his struggles with irritable bowel syndrome. He also recounted his battle with Lyme disease during his teenage years, noting the “brain fog” it brought. Due to Lyme disease contracted at age 13, he missed soccer tryouts and, at 15, began noticing “mild cognitive decline,” he wrote.

He reported that his symptoms worsened significantly in 2017, during his studies at the University of Pennsylvania, although follow-up Lyme tests returned negative.

2019: A Counselor at Stanford

Mangione spent a summer at Stanford University, where he worked as a counselor in a pre-collegiate program from May to September 2019, according to his LinkedIn profile, confirmed by a Stanford representative who spoke with the Los Angeles Times.

2020: Ivy League Graduate

Mangione graduated cum laude from the University of Pennsylvania, earning a degree in engineering and applied sciences, as highlighted on his LinkedIn. His social media showcased moments with his Phi Kappa Psi fraternity brothers and visits to popular tourist spots in Mexico and Puerto Rico. During his college years, he initiated a video game development club.

In the same year, according to his LinkedIn, he began employment as a data engineer at TrueCar Inc., a car marketplace based in Santa Monica, California.

2022: Exploring Hawaii and Discussing Surgery

For the first half of 2022, Mangione lived in Honolulu, Hawaii, at a cooperative living arrangement called SurfBreak. The founder, R.J. Martin, mentioned that Mangione experienced considerable back pain and frequently mentioned needing surgery.

Martin noted that Mangione ceased communication around the summer.

“He went silent in June or July,” Martin explained.

2023: Dealing with Pain and Surgery

Mangione left his position at TrueCar in 2023, as confirmed by a representative from the company.

In July, a review of his Reddit posts revealed he mentioned that his “back and hips locked up after the accident, and my entire lumbar/hips have been out of alignment since.”

In response to another post that same month, Mangione shared about feeling bladder and genital discomfort, ongoing back pain, and sciatica following his injury. He reported numbness in his groin and bladder, and below his right knee.

In August, he wrote an encouraging message on a subreddit focused on spondylolisthesis—a condition where spinal bones become misaligned and lead to chronic pain. His post aimed to uplift others dealing with similar issues.

That same month, Martin reached out to Mangione via text after he had departed Hawaii earlier that summer, and Mangione responded by sending photos of his back surgery.

2024: From Missing Person to Infamous Figure

In January, Mangione rated The Unabomber Manifesto four stars on Goodreads.

In May, he shared a post on social media related to health care, mentioning, “My experience with the medical field—and you might agree—is that doctors are generally ineffective unless you manage them closely, and two-thirds of them are lacking value.”

“Even in that situation,” the post mentioned.

Friends have informed news sources that Mangione had ceased communication over the last six months.

According to the New York Times, in July, a man tagged a social media profile that seemed to be Mangione’s, stating that he hadn’t heard from him in several months. The individual wrote in a now-deleted post: “You made promises regarding my wedding and if you cannot keep them, I need to know so I can make arrangements.”

Mangione’s mother reported him missing to the San Francisco police just two weeks before the shooting, as stated by John Chell, Chief of Patrol at the New York Police Department, in an interview with NewsNation.

On November 24, police reported that Mangione arrived in New York City by bus from Atlanta, although it remains unclear where he boarded the bus. He subsequently checked into a New York hostel using a false identity before the shooting on December 4, divulged the police.

On December 4, around 6:45 a.m., Thompson was shot in Midtown Manhattan outside a hotel where he was scheduled to speak at an investment conference. The suspected shooter fled on foot and rode an electric bike into Central Park. Authorities noted that the suspect was seen getting into a taxi around 7 a.m. on the Upper West Side and later at a bus station uptown approximately 45 minutes afterward.

On December 5, police released images of the suspect after analyzing surveillance footage in their subsequent manhunt. The unidentified killer gained notoriety on social media.

On December 9, a McDonald’s employee in Altoona, Pennsylvania, reported seeing Mangione acting suspiciously around 9:15 a.m., carrying several fake IDs as well as a U.S. passport, according to NYPD.

Mangione was charged in Pennsylvania for carrying a firearm without a license, tampering with identification records, possession of crime instruments, and presenting false identification to the police. Later, he faced additional charges of murder and four weapons felonies in New York City.