Luigi Mangione, the man charged with murdering UnitedHealthcare CEO Brian Thompson , was in court Monday for pretrial hearings about which evidence will be allowed in his upcoming trial in New York City.

Mangione has pleaded not guilty to nine state charges , including murder, as well as other federal charges that carry the possibility of the death penalty. Back in September, a judge dropped two other state terrorism charges against him.

The 27-year-old's defense attorneys are arguing that certain evidence should be excluded from trial because of how they say it was obtained.

Prosecutors with the Manhattan's district attorney's office have denied the defense's accusations, but the judge called for a series of suppression hearings to go over the concerns.

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