The suspect arrested in Pennsylvania in the United Healthcare CEO has a handwritten manifesto that criticized health care companies for putting profits above care

Luigi Mangione, a 26-year-old tech enthusiast and suspect in the killing of UnitedHealthcare CEO Brian Thompson, allegedly used a ghost gun, possibly crafted with a 3D printer, in the attack, according to authorities.

“He was in possession of a ghost gun capable of firing a 9-mm round, along with a suppressor,” NYPD Commissioner Jessica Tisch stated during a press briefing on Monday. She added that the weapon “may have been made on a 3-D printer.”

Mangione, identified as an anti-capitalist Ivy League graduate, was apprehended at a McDonald’s in Altoona, Pennsylvania, concluding a nationwide manhunt. Police believe the motive may stem from resentment toward the medical community due to the treatment of a sick relative, according to sources.

Law enforcement recovered untraceable weapons, a silencer, a U.S. passport, four fake IDs, and a two-and-a-half-page manifesto from Mangione at the time of his arrest. The manifesto reportedly read, “These parasites had it coming,” according to law enforcement sources.

Mangione, originally from Towson, Maryland, reportedly admired quotes attributed to the “Unabomber” Ted Kaczynski, further emphasizing his extremist anti-capitalist ideology. The fatal shooting of Thompson took place outside a Manhattan hotel last week, sparking an intensive investigation.