Manhunt for UnitedHealthcare CEO Brian Thompson’s killer enters second day — here’s what major clues investigators are looking at

The manhunt for the cold-blooded assassin who gunned down UnitedHealthCare CEO Brian Thompson in Midtown entered its second day Thursday — and investigators have no shortage of clues. Beyond the chilling first image showing the masked suspect’s face — in which he grins widely — NYPD detectives and FBI agents ran down leads and processed...