After a three-day manhunt for the UnitedHealthcare CEO's murder suspect, Aaron Katersky has the latest on the investigation, including why police believe the suspect has left New York City and the new evidence sources say police have found in Central Park; as concerns about the bird flu outbreak grow, Steve Osunsami has details on the new USDA order for raw milk samples nationwide to be collected and tested for the virus; Matt Gutman reports on the mother of American journalist Austin Tice – who was kidnapped in 2012 near Syria's capital – saying she has a "significant source," who she claimed was vetted by the U.S. government, that confirmed her son is alive and treated well; and more on tonight's broadcast of World News Tonight with David Muir.

Nearly a week after the UnitedHealthcare CEO was gunned down outside a New York City hotel, Aaron Katersky has the latest on police taking 26-year-old Luigi Mangione into custody as a person of interest after he was recognized at a McDonald's in Altoona, Pennsylvania; Stephanie Ramos has details on a jury finding Daniel Penny not guilty of criminally negligent homicide for the chokehold death of Jordan Neely on a New York City subway train; James Longman reports from Damascus, where Syrian rebels have seized power and forced Pres. Bashar Al-Assad to seek asylum in Russia; and more on tonight's broadcast of World News Tonight with David Muir.