Ali Qazimaj is believed to have entered the UK as an asylum seeker and gained work as a forklift driver in Essex
An image of a car used by a man wanted in connection with a missing woman and her murdered husband has been released by police.
Sylvia and Peter Stuart, aged 69 and 75, were reported missing on Friday. The same day Mr Stuart's body was found near his Suffolk home.
Ali Qazimaj, 42, of Tilbury, is wanted over the murder and disappearance.
Police hope the image of his abandoned Citroen C3 will yield fresh information about his whereabouts.
Suffolk Police has warned the chances of finding Mrs Stuart alive "is becoming less and less likely" as time passes.
Ali Qazimaj's Citroen C3 car was found in Athol Terrace in Dover on Sunday
Police say Mr Qazimaj probably boarded a passenger ferry as an unaccompanied foot passenger to Calais in France.
Det Ch Supt Simon Parkes said: "We are gradually building a picture as we continue to make enquiries to trace Ali Qazimaj.
"We still need anyone who knows him, who may have spent time with him over the last few weeks or before this to get in touch and tell us more about his background so that we can trace his movements."
Sylvia Stuart is still missing. The body of her husband, Peter, was found in woods on Friday
The couple visited a farm shop together five days before they were reported missing and Mr Stuart was found dead
Mr Stuart was found dead in woodland surrounding their home on Friday evening.
Det Ch Insp Parkes said efforts to find Mrs Stuart were concentrated on the UK and there was no suggestion she was involved in her husband's murder.
The couple's son-in-law, Steve Paxman, 61, of Leicester, was arrested on Sunday and released on bail on Monday night.
Ali Qazimaj - what we know
Aged 42, about 5ft 6in (1.7m) with brown eyes and dark brown greying hair
Uses the alias Marco Costa
Police believe he is from Kosovo and was granted asylum and a UK passport following the conflict in the former Yugoslavia
Lived in Tilbury, Essex, and worked in Purfleet as a forklift driver
Police have received '"reliable information" which places him at Dover's ferry terminal at about 18:30 BST on Saturday
It is "strongly believed" that he then boarded a passenger ferry unaccompanied to Calais in France soon after 19:00
His silver Citroen C3 was found at about midnight on Sunday on Athol Terrace, within sight of the ferry terminal
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