NEW YORK — Moments after Luigi Mangione was handcuffed at a Pennsylvania McDonald’s, a police officer searching his backpack found a loaded gun magazine wrapped in a pair of underwear.

The discovery, recounted in court Monday as Mangione fights to keep evidence out of his New York murder case, convinced police in Altoona, Pennsylvania, that he was the man wanted in the killing of UnitedHealthcare CEO Brian Thompson in Manhattan five days earlier.

“It's him, dude. It's him, 100%,” an officer was heard saying on body-worn camera video from Mangione’s Dec. 9, 2024 arrest, punctuating the remark with expletives as the officer combing the bag, Christy Wasser, held up the magazine.

Wasser, a 19-year Altoona police veteran, testified on the fourth day of a pretrial hearing as Mangione sought t

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