Nearly a year after UnitedHealthcare CEO Brian Thompson was gunned down on a Manhattan sidewalk, the man accused in the killing returned to a New York courtroom Monday as his lawyers tried to keep some of the most explosive evidence out of a future jury trial.

Luigi Mangione, 27, appeared in Manhattan Supreme Court for the first in a series of pretrial suppression hearings that will determine whether prosecutors can use a handgun, a red notebook and several of his statements to police in the state murder case, per CBS News .

Mangione has pleaded not guilty to nine state counts, reported AP News , including second-degree murder and multiple weapons charges, and faces a separate federal case in which prosecutors are seeking the death penalty. Trial dates in both courts have not yet bee

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