Although once used in the past by the British to illustrate a person who collects refuse. It has recently been used to illustate a person who is called to collect dead bodies and bring them to the morgue. In some high crime areas (such as detroit) dustmen often will drive around looking for a crime scene and get first dibs on transporting the body.
Police officer to dispatcher: Victim has been shot 10 times in the head. Request a dustman to the corner of Linwood and Grand.