By MICHAEL R. SISAK and JAKE OFFENHARTZ, Associated Press NEW YORK (AP) — The man accused of fatally shooting the CEO of UnitedHealthcare pleaded not guilty on Monday to state murder and terror charges while his attorney complained that statements coming from New York’s mayor would make it tough to receive a fair trial. Luigi Mangione, 26, was shackled and seated in a Manhattan court when he leaned over to a microphone to enter his plea.