Maroondah Crime Investigation Unit detectives are appealing for public assistance following an extortion in Croydon South in August.
Police have been told a man attended an address in Croydon South about 9.20am on 21 August and knocked on the victim's front door.
When the victim opened the door the man threatened him.
The victim had never seen the man before and told his wife to call police.
The man left the address and was followed by the victim to an address on Faraday Road, Croydon South where the man remained in the rear yard for a short time before continuing on along Faraday Road.
The offender is perceived to be Caucasian, 40-50-years-old and at the time of the incident was wearing a black jumper, brown work pants, brown work boots and an orange hi-vis vest.
Investigators have released an image of a man they believe may be able to assist them with their enquires.
Anyone with information on fraudulent activity is urged to contact Crime Stoppers on 1800 333 000 or at www.crimestoppersvic.com.au.
