A man wanted after the murder of north Suffolk grandfather Peter Stuart and disappearance of his wife Sylvia used an alias, Suffolk police said on Wednesday morning.
Detectives are appealing for more information to help them understand more about Ali Qazimaj who they believe is involved in the murder of Mr Stuart, 75.
Officers said he used an alias, Marco Costa, and came to the UK following the conflict in Yugoslavia.
Detective Chief Superintendent Simon Parkes, who is leading the investigation, said: 'We strongly believe that finding Ali Qazimaj will help us in locating Sylvia, who has now not been seen for nearly 10 days.
'We know that he was living in Tilbury in Essex and that he has been working in Purfleet as a forklift driver. We believe he is from Kosovo, that he sought asylum following the conflict and was granted this and given a British passport. We also know he has used the name Marco Costa.
'Our enquiries continue to learn more about his roots and his links within the UK and overseas. We urgently 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.
'We are particularly keen to hear from anyone who may have seen him between Sunday 29 May and when he left the country on Saturday 4 June, or anyone who can shed light on where he may have been between these times.'
Mr Qazimaj is described as white, around 5ft 6ins tall, with brown eyes and dark brown greying hair.
Suffolk police said yesterday it was 'strongly believed' Mr Qazimaj boarded a ferry to France on Saturday evening after the disappearance of Sylvia Stuart, 69, and the fatal stabbing of her husband last week.
Mr Stuart's body was found in woods next to the couple's home on Mill Lane in Weybread, near Harleston, on the evening of Friday June 3.
A post-mortem examination found he had been stabbed several times.
They were reported missing earlier that day having not been seen since the previous weekend.
Detectives investigating the couple's disappearance said Qazimaj, 42, had links with the family and finding him could lead them to Mrs Stuart. 'As time passes hopes of finding her alive are diminishing,' a police spokesman said.
Forces from across the UK and Europe were last night continuing the hunt for Qazimaj, from Tilbury in Essex.
Video showing the last recorded sighting of the couple, keen line dancers from Weybread near Fressingfield, was also released by officers yesterday.
The CCTV footage places the couple at Goodies Farm Shop in Wood Lane Pulham Market at 10.18am on Sunday, May 29, the day after a family gathering at their home and five days before relatives reported them missing to police.
Forensic teams carried out extensive searches of the area surrounding the couple's home in Mill Lane which continued yesterday.
A 61-year-old Leicester man, thought to be the couple's son-in-law Steve Paxman, was arrested in connection with the murder on Sunday morning. He was bailed on Monday to return on August 3, after police were given extra time to question him.
His car, a silver Citroen C3, had been found abandoned in Athol Terrace, Dover, at around midnight on Sunday.
Anyone with information can contact Suffolk police through the incident room on 01473 782000.
•We'll have the latest on the case today here
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