A chilling video shows the moments a gunman calmly shot UnitedHealthcare CEO Brian Thompson at point-blank range on the streets of midtown Manhattan.

In the video, the unidentified attacker – dressed in a black hoodie, black pants, gloves and a gray backpack – is seen systematically firing what appears to be a single-action handgun at the CEO pulls the slide back with every shot.

Thompson stumbles back as the first shot hits him in the back, before falling to the pavement and trying to crawl away as the gunman continues firing.

A police source told The Post that it appeared the shooter’s gun jammed at some point while firing, and he had to adjust the gun to clear the jam so he could continue firing, suggesting the assailant has a certain level of experience with firearms.