Detectives leading a homicide investigation in Sunderland have launched a fresh appeal for information.
39-year-old Patryk Mortimer died after a fire at Manor House in Easington Lane in the early hours of November 3.
He was found unconscious in the building and was pronounced dead shortly after.
An investigation was subsequently launched. More than 600 hours of CCTV footage has been seized and dozens of people have been spoken to by officers as part of their ongoing enquiries.
In total, six people were arrested on suspicion of murder and remain under investigation.
Now, as the enquiry enters its second month, senior investigating officer Detective Chief Inspector John Bent, has appealed for any witnesses who are yet to come forward to do so.
Anyone with information is asked to contact the police.