The man found dead at a house in north Belfast on Friday had been stabbed several times, police have said.
The body of Paschal McAfee (50) was found by his mother at a house in Henderson Avenue, off the Cavehill Road, at around 1pm on Friday.
A post mortem examination will be carried out to determine the cause of death.
Mr McAfee - who was also known as Basil - was last seen in an off-licence in Henderson Avenue at approximately 4pm on Thursday.
Detective Chief Inspector John McVea said officers need to find out where Mr McAfee went after being in the off-licence.
"Police are particularly keen to know where Basil was from approximately 4pm on Thursday 19 December," he said.
"We know that he had bought some alcohol in an off-licence just off the Cavehill Road, just before 4pm. We're keen to know who Basil was with just after that time, or where he had been."