panic on the new orleans parade route. one dead, four injured. a gunman opened fire. new orleans mardi gras back to pre-pandemic levels. but the police force watching this city is not. norah: breaking news, an arrest in connection with the murder of a catholic bishop shot at home. a woman killed in an alligator attack at a florida retirement community. actor richard belzer, also known as detective john munch on law & order: special victims unit has died. now, what i have to say tonight doesn t come from here. it comes from here. norah: good evening to our viewers in the west and thank you for joining us as we begin a new week together. tonight cbs evening news goes in-depth with a look at how americans are exposed to chemicals in our food. plus, the story of two 81-year-old best friends who are in the middle of a once-in-a-lifetime trip around the world. but first, the big story, the top-secret and historic trip. president biden to ukraine. security was