A 26-year-old man has been arrested on suspicion of the murder of 37-year-old father-of-two Wayne Boylan last month.
Mr Boylan was shot dead when two gunmen burst into a house on the Lower Dromore Road in Warrenpoint and shot him in the head with a shotgun.
A 21-year-old woman was also seriously injured in the attack after being struck in the face and neck by shotgun pellets.
The suspect arrested on Thursday is also being held on suspicion of attempted murder.
At the time, police appealed for information in relation to a car driving erratically in the direction of Newry.
Police this week confirmed that they conducted a search in the Newry area on Tuesday as part of their ongoing investigation into the brutal murder.
Earlier today, a 44-year-old man also arrested on suspicion of Mr Boylan’s murder has been released on police bail pending further inquiries.
Detectives investigating the murder of Wayne Boylan in Warrenpoint last month have arrested a 26 year old man on suspicion of murder. He has also been arrested on suspicion of attempted murder and is currently in police custody.
— PSNI (@PoliceServiceNI) February 14, 2019
The man was arrested by detectives on Tuesday on suspicion of murder, attempted murder and a drug-related offence.