Suspect in UnitedHealthcare CEO Brian Thompson’s killing has left NYC, cops believe: sources

The suspect who gunned down UnitedHealthcare CEO Brian Thompson is believed by police to have left New York City, The Post has learned.

NYPD investigators believe the assassin came from out of town to murder Thompson and slipped away at some unknown point after committing the deadly deed Wednesday, sources have told The Post.

The masked man seen in surveillance footage from the killing — and smiling chillingly in the sole image of his face — likely had no ties to the Big Apple, explaining his apparent days-long stay at an Upper West Side hostel, sources said.

Police have been checking the city’s airports and bus and train stations in the belief that the suspect fled the city, perhaps to return to the still-unknown location where he lives, the sources said.

Investigators believe he arrived in the city Nov. 24 on a bus on an Atlanta-to-New York City route. He checked into the hostel with a fake New Jersey ID.