Dramatic footage has emerged of the brazen execution of former bikie boss Mahmoud “Mick” Hawi in the car park of a south Sydney gym.

The former Comanchero national president was shot multiple times in the head and body when he was ambushed after a gym workout at Fitness First Rockdale on February 15.

CCTV footage aired on Seven News shows Hawi, 37, climbing into his Mercedes-Benz four-wheel-drive before a balaclava-clad gunman sprints towards the driver's side window.

He points his pistol into the window and appears to fire a flurry of shots at close range before he runs from the car park.