NEW YORK (AP) — Moments after Luigi Mangione was put in handcuffs 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 exclude evidence from his New York murder case, convinced police in Altoona, Pennsylvania, that he was the man wanted for killing UnitedHealthcare CEO Brian Thompson in Manhattan five days earlier.

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