Police investigating the killing of an asylum seeker in Middlesbrough have revisited the scene.
Haileab Tadesse, 35, of Eritrea in East Africa, was found at a house in Palm Street on 4 April.
An Eritrean man, aged 30, has been charged with his murder and remanded in custody.
On Monday night nine detectives carried out house-to-house inquiries. They are trying to trace a man seen walking his dog in Palm Street at the time.
Det Ch Insp Alastair Simpson said the dog-walker, who was seen in Palm Street between 2000 BST and 2100 BST on 4 April, could have vital information.
He said: "Once again I'd like to thank members of the public who have taken the time to speak to police about what they saw last Monday night.
"The inquiry last night has led to the identification of further potential witnesses and it remains important that we speak to anyone who was in the area of Palm Street."
Police said Mr Tadesse had been granted asylum to remain in the UK until 2016.