Brian Thompson: search for shooter continues for third day as police reveal clues

Police release information about UnitedHealthcare CEO's killing on Manhattan street but suspect remains at large

The search for the suspected assassin in the brazen Manhattan killing of the chief executive of UnitedHealthcare, Brian Thompson, has entered a third day as police revealed clues to the killer's identity but many facts about the shocking shooting still remain unknown.

Thompson was fatally shot at about 6.40am ET on Wednesday in front of a Hilton hotel in midtown Manhattan, just before he was scheduled to speak at the company's annual investor conference.