Police were called on December 31 to a report of a vulnerable 79-year-old woman who had been a victim of a scam.
It is believed a man took thousands of pounds from her.
The man reportedly entered the property on Melrose Avenue, Worthing and claimed to do work for the victim, then charged her.
Officers would like to speak to the man in the image as they believe he can assist with their enquiries.
If you recognise the man, or have any information, contact police online or call 101 quoting serial 1172 of 31/12.