Luigi Mangione, a suspect in the fatal shooting of UnitedHealthcare CEO Brian Thompson, used a ghost gun that may have been 3D printed

Luigi Mangione, the 26-year-old tech genius suspected of shooting UnitedHealthcare CEO Brian Thompson last week, is believed to have used a ghost gun that he may have made on a 3D printer in the murder, authorities said with.

“He was in possession of a ghost gun that was capable of firing a 9mm cartridge and a silencer,” NYPD Commissioner Jessica Tisch said at a news conference Monday, adding that the piece “may have been on one 3D model could have been made by printer.”

Cops nabbed Mangione — an anti-capitalist Ivy League graduate who liked online quotes from “Unabomber” Ted Kaczynski, according to sources — while he was eating at a McDonald’s in Altoona, Pennsylvania, ending an intense manhunt. which began after he executed Thompson outside a Manhattan hotel last week.

Mangione, originally from Towson, Maryland, may have hated the medical community because of the way she treated a sick relative, sources said.

Aside from the untraceable homemade weapon, the former prep school valedictorian was caught with a silencer, a U.S. passport, four fake IDs with names used during the killer’s stay in New York City and a two-and-a-half-page manifesto, sources said .

In the letter, he seethed that “these parasites have done it,” law enforcement sources told The Post on Monday.