Detectives investigating the death of a 45-year-old man in Craigavon, Co Armagh, yesterday have arrested a fourth person.
The 17-year-old was arrested in the Craigavon area last night.
Police have already arrested three men – aged 20, 27 and 36 – in connection with this death, all of whom remain in custody.
The victim was treated at the scene by police officers and paramedics after being stabbed during an altercation at a house in the Parkmore area of Craigavon at about 12.45am yesterday.
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He was then transferred to hospital, where he later died.
Anyone who witnessed the incident, or who was in the Parkmore or Enniskeen area at the time, is asked to contact the PSNI or Crimestoppers.