Matt Rivers reports on the Arctic air sweeping across the U.S., bringing freezing cold and a blast of snow to millions from Michigan to Virginia to Maine, and Ginger Zee has the forecast; Aaron Katersky has details on the Altoona police officer who testified about searching Luigi Mangione's backpack after he was apprehended at a Pennsylvania McDonald’s, as prosecutors release a trove of new evidence against him; David Muir stops by Rubirosa restaurant in New York City's Nolita neighborhood for