A fifth person has been arrested by detectives investigating the fatal stabbing of a man in east Belfast at the weekend.
Police have named the victim as 21-year-old James Stitt, who was from the area. He was attacked in Castlereagh Place at about 22:00 GMT on Saturday.
Det Ch Insp Alan Dickson said a 29-year-old woman was arrested on Monday.
Detectives are continuing to question three men aged 21, 25 and 31 and another woman aged 25.
Police said they were following a definite line of inquiry and have appealed for information about the attack.
Neighbours described the couple who live at the house as quiet and private people who have lived there for many years.
Emergency services tried to resuscitate the man on the pavement outside the house but he died a short time later.
Progressive Unionist Party councillor John Kyle said the community has been left in shock.
"Tragically we have a family now facing Christmas having lost in the most tragic of circumstances a 21-year-old son," he said.
DUP assembly member Robin Newton said it was a "dreadful incident".
"A young man of 21 years with all his life in front of him is now lying in the morgue," he said.