nbc 5 nightly update August 17, 2021 7:18 pm Nightly Update: Mask Mandate Returns to Chicago Friday Here are the latest stories in the NBC 5 Nightly Update for Tuesday, Aug. 17, 2021. Local 2:02 Manhunt underway for suspect in Chicago police officer's killing 1:42 Warrant issued for suspect in murder of Chicago police officer 2:28 Tips on how to tell people you're adhering to a plant-based diet 2:15 Politicians, season ticketholders skeptical on Bears' plans for new stadium 1:39 C2E2 opens up at Chicago's McCormick Place