Accused Ivy League assassin Luigi Mangione appeared in Manhattan court Monday looking preppy — with his trademark bushy brows carefully manicured as he smirked and furiously scribbled notes — for a key pretrial evidence hearing in his murder case. The 27-year-old former prep-school scholar, dressed in a gray suit over a Tattersall white-and-red checkered collared shirt, was led into the room through a side door before taking a seat at the defense table for the start of the proceeding...