(NEW YORK) — One year after prosecutors say Luigi Mangione brazenly assassinated UnitedHealthcare CEO Brian Thompson in midtown Manhattan, the 27-year-old is back in court Monday for a multi-day hearing that could determine the balance of evidence in his state murder trial.

Mangione’s attorneys are trying to limit prosecutors from using key evidence — including a 3D-printed gun and purported journal writings — police say they obtained when they arrested him in Pennsylvania last year.

Mangione entered the courtroom and took a seat next to his attorneys, Karen Friedman Agnifilo and Marc Agnifilo, as nearly two dozen Mangione supporters seated in the back row of the courtroom craned their necks to get a look at the accused killer. Some were dressed in T-shirts displaying slogans about the c

See Full Page