A series of pretrial hearings for Luigi Mangione began Monday in Manhattan Supreme Court with his attorneys arguing to suppress key pieces of evidence gathered in his arrest for the slaying of UnitedHealthcare’s CEO Brian Thompson.

Thompson was shot dead almost one year ago in Midtown Manhattan. The Manhattan District Attorney’s office and the U.S. Attorney’s office for the Southern District of New York are each bringing their own murder cases against Mangione — with the latter seeking the death penalty for the 27-year-old defendant.

Mangione was in the courtroom on Monday morning, wearing a charcoal suit over a checkered white shirt. Unlike his past appearances in state court, Mangione was brought before Acting Manhattan Supreme Court Justice Gregory Carro without walking him through a

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