The couple stabbed to death at their Surrey home have been identified as Patrick and Gillian Kettyle, Sky News reports.
The bodies of the man and woman, in their 50s, were found dead at a home in The Copse, Fetcham, near Leatherhead, around 1230 GMT this morning, (27 November).
Surrey and Sussex police have launched a manhunt to find Lithuanian builder, Viktoras Bruzas, 38, from Walton-on-Thames. He is believed to be driving a black Mercedes registration AU11WJY.
Detective chief inspector Mark Preston, has urged the members of the public not to approach Bruzas.
Police have cordoned off the home and street while residents in the quiet neighbourhood come to terms with the tragedy.
An elderly neighbour said: "I can't remember anything like this ever happening around here. This is all a bit of a surprise."
Preston said: "This is a tragic incident where two people have lost their lives and our thoughts are with their family at this extremely difficult time.
"We are still in the very early stages of the investigation but we need to trace Viktoras Bruzas as a matter of urgency.
"Sometimes, for whatever reason, people may wish to provide information anonymously and this can be done so through the independent charity Crimestoppers on 0800 555 111."
Another man in his 30s has been arrested in Walton-on-Thames on suspicion of conspiracy to commit murder.
Surrey Police did not confirm the identity of the couple but said a formal ID would be issued in due course.