Police hunting the killers of business owner Alan Wood at his home near Bourne have named a man they want to speak to about the crime.
Mr Wood (50) was bound and tortured at his home in Lound in October 2009 before his bank cards were stolen and used in Bourne and Stamford just days later.
No motive for the murder has been found and police are now trying to trace Pawel Wrzyszcz, thought to be in his 20s to early 30s, who worked at car washes in Peterborough and Stamford in 2009.
Det Supt Stuart Morrison, who is leading the investigation, said: “We have made enquiries in Poland as to Pawel’s whereabouts and believe that he would have been in the area around this time.
“I would like to stress that Pawel is not a suspect in this case and we would simply like to talk to him to see if he has any information that may help us in our enquiries.
“If anyone knows Pawel or knew him at the time, please contact us as soon as possible.
“Likewise if Pawel himself sees this appeal, we would very much like to hear from him.”
Mr Wood’s death sparked one of the biggest murder hunts Lincolnshire has seen in recent years due to the vicious nature of the crime.
The 50-year-old former supermarket worker was married to ex-wife Joanne Wood for 17 years and set up a garden maintenance business.
Det Supt Morrison said: “The criminal or criminals involved, despite the use of an extraordinary level of violence, walked away with just a few hundred pounds and beyond a possible financial motive, it is still not known why the most disturbing crime in recent Lincolnshire history was committed.
“We are coming up to the five-year mark since Alan was murdered and our determination to catch his killer or killers has not waned.
“Extensive avenues have been explored during the investigation and we have followed up on countless leads, but we are as motivated and committed as ever to finding who is responsible for his death.”
Anyone with information should ring the Major Incident Room at Lincolnshire Police on 01522 885385 or Crimestoppers, anonymously, on 0800 555 111.