The man charged with killing UnitedHealthcare CEO Brian Thompson on a Manhattan street was seen near a Port Authority bus station 46 minutes after the shocking crime, police said, before he made his way to Pennsylvania, where he was eventually arrested.

Thompson was shot from behind outside the New York Hilton Midtown hotel Wednesday, Dec. 4, as he was on his way to UnitedHealth Group’s investor conference, officials have said.

Police believe the shooter left the city, triggering an…