A year to the day after Luigi Mangione allegedly stalked and gunned down United Healthcare CEO Brian Thompson on a Manhattan sidewalk, the 27-year-old alleged killer returns to court Thursday as a high-profile hearing in his state murder case enters its third day. His lawyers are attempting to convince the judge overseeing his case to prohibit prosecutors from using critical evidence, including the alleged murder weapon and Mangione's journal. They argue the evidence was unlawfully seized from his backpack without a warrant during his arrest . The hearing has the potential to sideline what prosecutors say is some of the strongest evidence of Mangione's guilt, and has provided the most detailed preview to date of their case against the alleged killer. As Mangione sat alongside his lawyers,

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