Police have arrested 26-year-old Luigi Nicholas Mangione, who is considered a suspect in the fatal shooting of UnitedHealthcare CEO Brian Thompson. Thompson was fatally shot outside the New York Midtown Hilton hotel Wednesday in what police described as a “brazen, targeted attack.”

New York Police Commissioner Jessica Tisch said Monday that Mangione was found with a gun consistent with the one used to kill Thompson, along with a silencer as well as a false New Jersey ID police allege he used to check into an Upper West Side hostel where the shooter is believed to have stayed. Tisch said the ghost gun capable of firing a 9 mm round and a suppressor.

Mangione was taken into custody after tipsters at a McDonald’s in Altoona, Pa. found him suspicious and contacted local authorities. Mangione was born and raised in Maryland and has ties to San Francisco, though his last known address is in Honolulu, Hawaii.

Mangione had a “manifesto” on his person criticizing healthcare companies when he was detained, according to law enforcement sources, who added that the name the suspect used on his fake ID was Marc Rosario. They believe the shooter arrived in New York City in late November, taking a bus that originally left from Atlanta.  Tisch said that Mangione’s handwritten document “that speaks to his motivation and mindset .. It does seem that he had some ill will toward corporate America,” and added that it appears Mangione acted alone.

A UnitedHealth Group spokesperson said in a statement Monday, “Our hope is that today’s apprehension brings some relief to Brian’s family, friends, colleagues and the many others affected by this unspeakable tragedy. We thank law enforcement and will continue to work with them on this investigation.”

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