Video footage released of UnitedHealthcare CEO Brian Thompson being executed by a masked gunman.

Video footage shows a man in the grey backpack pulling out a pistol with a silencer on it before opening fire.

The man was seen firing multiple shots at Thompson who stumbled to the ground.

According to The New York Post, the weapon jammed at one point, prompting the gunman to fix it so he could keep firing.

He then fled down an alley and was last seen in Central Park.