As the search for UnitedHealthcare CEO Brian Thompson’s killer goes on, New York police late Saturday released two additional photos of the suspected shooter that appeared to be from a camera mounted inside a taxi. The first shows him outside the vehicle and the second shows him looking through the partition between the back seat and the front of the cab. In both, his face is partially obscured by a blue, medical-style mask. Retracing the gunman’s steps using surveillance video,...