Episode 322

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.