NEW YORK — Luigi Mangione appeared in court Monday seeking to bar evidence from his state trial over the killing of UnitedHealthcare CEO Brian Thompson, including the gun that authorities say matches the one used in the brazen New York City attack.

Among the evidence Mangione’s lawyers want to prevent the Manhattan District Attorney’s Office from presenting to jurors are a 9 mm handgun that prosecutors say matches the one used in the Dec. 4, 2024, killing and a handwritten notebook in which they say Mangione described his intent to “wack” a health insurance executive.

After getting state terrorism charges thrown out in September, the defense lawyers are zeroing in on what they say was unconstitutional conduct that tainted his arrest and threatens his right to a fair trial.

They contend

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