Luigi Mangione is facing a second-degree murder charge in New York City in connection with the brazen shooting of UnitedHealthcare CEO Brian Thompson in Midtown Manhattan as new details emerge about the suspect and a potential motive, according to police.

When 26-year-old Mangione was arrested on Monday he had “written admissions about the crime” with him, according to the New York arrest warrant.

Mangione had several handwritten pages on him that appeared to express a “disdain for corporate America” and to indicate “he’s frustrated with the health care system in the United States,” NYPD Chief of Detective Joe Kenny told ABC News’ “Good Morning America” on Tuesday.

“Specifically, he states how we are the No. 1 most expensive health care system in the world, yet the life expectancy of an American is ranked 42 in the world,” Kenny said.

Whether Mangione has a personal connection to UnitedHealthcare is unknown, NYPD Commissioner Jessica Tisch said, but the writings mention UnitedHealthcare by name, law enforcement sources told ABC News.

The sources described the handwriting as sloppy and included these quotes: “These parasites had it coming” and “I do apologize for any strife and trauma, but it had to be done.”

Mangione — who was arrested in Altoona, Pennsylvania, on Monday in connection with Thompson’s Dec. 4 slaying — remains in the custody of the Pennsylvania Department of Corrections pending his extradition to New York.

The NYPD was “thrilled” to get the call from Altoona police that they had a person of interest in custody, Tisch told “GMA.”

Kenny said “the key to this case” was releasing the photo of the suspect’s face to the media and the public.

“That picture reached Pennsylvania,” where Mangione was recognized at a McDonald’s on Monday morning, he said.

“We are grateful as a city to that person,” Tisch said.

“We had collected early in the investigation some forensic evidence, some DNA evidence, some fingerprints, so we were very confident that we were ultimately going to get to the right person,” Tisch added.

“We do have a lot of evidence in this case,” Tisch told “GMA.”

Mangione was apprehended “in possession of the same New Jersey fake identification that was used at the hostel” on New York’s Upper West Side before Thompson was gunned down on Dec. 4, she said.

The gun Mangione was allegedly found with on Monday “looks very similar” to the gun used in the murder, “with a similar suppressor,” Tisch said. “So there’s a lot of reasons that we feel very strongly that he is the person of interest.”

Officers allegedly found a black 3D printed pistol and a black silencer, which was also 3D printed, according to the criminal complaint filed in Blair County, Pennsylvania.

“The pistol had one loaded Glock magazine with six nine-millimeter full metal jack rounds. There was also one loose nine-millimeter hollow point round,” according to the complaint.

Kenny described the weapon as a “ghost gun,” meaning it had no serial number and was untraceable.

Mangione, a Maryland native and Ivy League graduate, was also charged in New York with possession of a loaded firearm, possession of a forged instrument and criminal possession of a weapon.

He was charged with five crimes in Pennsylvania, including carrying a gun without a license, forgery, falsely identifying himself to authorities and possessing “instruments of crime,” according to the criminal complaint.

His family said in a statement that they’re “shocked and devastated by Luigi’s arrest. We offer our prayers to the family of Brian Thompson and we ask people to pray for all involved.”

Police are now looking at Mangione’s travel at various points across the United States and out of the county within the past year, sources said.

The Pennsylvania State Police is asking for the public’s help piecing together Mangione’s travel in Pennsylvania. Anyone with information is asked to call 1-800-4PA-TIPS.

Meanwhile, suspect Luigi Mangione couldn’t be located by his family earlier this year, reports say.

On Nov. 18, his mother Kathleen reported him missing to the San Francisco Police Department, a police source told The San Francisco Standard.

The San Francisco Police Department did not immediately respond Tuesday morning to a request for comment by Fox News Digital.

Aaron Cranston, who was one of Mangione’s former classmates at the private Gilman School in Baltimore, also told The New York Times that he and his colleagues received a message earlier this year stating that Mangione’s family hadn’t been able to get in touch with him for several months following a back surgery.

At the time, Mangione’s family was trying to track him down, the newspaper added, citing Cranston.

______________________________________________________________________ “Enhance Legal Practice With Authoritative Reports” — Alexander Payne Offers Comprehensive Law Reports, Spanning Over A Century Of Nigerian Jurisprudence

Interested buyers are encouraged to place their orders and enquiries via: 0704 444 4777, 0704 444 4999, 0818 199 9888 Website: www.alexandernigeria.com

_______________________________________________________________________ [A MUST HAVE] Evidence Act Demystified With Recent And Contemporary Cases And Materials
“Evidence Act: Complete Annotation” by renowned legal experts Sanni & Etti.
Available now for NGN 40,000 at ASC Publications, 10, Boyle Street, Onikan, Lagos. Beside High Court, TBS. Email publications@ayindesanni.com or WhatsApp +2347056667384. Purchase Link: https://paystack.com/buy/evidence-act-complete-annotation _______________________________________________________________________ Groundbreaking Guide For Lawyers: Adigwe Publishes ‘Artificial Intelligence For Lawyers’ With Free Research eBook The book also examines Nigeria's legal ecosystem, focusing on the LPELR and NBA AI Guidelines. As a bonus, every purchase comes with a FREE eBook titled: How to Use the AI Features in LegalPedia and LawPavilion. Ohio Books Ltd praises the publication, stating: "....this is the only Nigerian book I know of on the topic." How to Order: 📞 Call, Text, or WhatsApp: 08034917063 | 07055285878 📧 Email: benadigwe1@gmail.com 🌎 Website: www.benadigwe.com Ebook Version: Access it directly online at https://selar.com/prv626 Authored by Ben Ijeoma Adigwe Esq., ACIarb (UK), LL.M, Dip. in Artificial Intelligence, Director at the Delta State Ministry of Justice, Asaba, Nigeria. _______________________________________________________________________