New York police are searching for the gunman who fatally shot Brian Thompson, CEO of UnitedHealth’s insurance unit, outside a Midtown hotel in what authorities described as a targeted attack. The assailant fled into Central Park, and security footage shows the shooter waiting for Thompson before the attack. No suspects have been named, and the motive remains unclear as investigations continue. The incident occurred just before the company’s annual investor conference and coincided with the city’s holiday festivities.