Detectives have named the 47-year-old man who was murdered in north Belfast’s Harcourt Drive as Martin Gavin.
Major Investigation Team detectives have also issued a photograph of Mr Gavin.
Detective Chief Inspector John Caldwell said: “Martin Gavin died as a result of injuries sustained on Friday 7 January. He had been stabbed.
“Police were called to a house in Harcourt Drive at around 6.15am that Friday. Mr Gavin was taken to hospital, but sadly passed away just over four weeks later, on the morning of Sunday 6 February.
“A murder investigation has been launched, and I would reiterate our appeal to anyone with information to come forward.
“If you were in the Harcourt Drive area late on Thursday 6 January or early on Friday 7 January and noticed any suspicious activity, please contact us on 101 quoting reference number 188 07/01/22.”
A report can also be made using the online reporting form via www.psni.police.uk/makeareport
Alternatively, information can be provided to Crimestoppers anonymously on 0800 555 111 or online at www.crimestoppers-uk.org