The professionalism of the hit on Mr Palmer meant the police were convinced his murder was an underworld assassination.
Police believe there may have then been a brief exchange before the his assassin opened fire, hitting Mr Palmer in the right elbow, the right side of the chest and the right side of the stomach.
It is thought the 65-year-old then managed to stagger away for about 20 metres before collapsing on the ground.
The gunman then calmly walked up to his prone figure and emptied another three bullets into him, hitting him in the left arm, the top of the back and the left hand side of his torso.
Wouldn’t a professional actually be able to shoot? You know, couple of shots, ‘ee’s dead mate?