The standard operating procedures for search warrants will be reviewed after the shooting death of a Sydney police officer.

Constable William Crews, 26, was taking part in a raid with the Middle Eastern Organised Crime Squad in Bankstown, in Sydney's south-west on Wednesday night, when he was shot in the head and neck.

He died from his injuries in a Sydney hospital yesterday morning.

Constable Crews was not wearing a bullet-proof vest when he was shot.