NEW YORK — Luigi Mangione watched stoically in court Monday as prosecutors played surveillance videos showing the killing of UnitedHealthcare CEO Brian Thompson on a New York City sidewalk last year and Mangione’s arrest five days later at a McDonald’s in Pennsylvania.

The videos, including footage from the restaurant previously unseen by the press or the public, kicked off a hearing on Mangione’s fight to bar evidence from his state murder trial, including the gun prosecutors say matches the one used in the Dec. 4, 2024, attack. Thompson was killed as he walked to a Manhattan hotel for his company’s annual investor conference.

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