The man who was shot dead in Co Down has been named by police as Wayne Boylan.
The 37-year-old was killed in the shooting incident in Lower Dromore Road, Warrenpoint, on Friday evening.
A 21-year-old woman was also injured after two men entered a property and opened fire.
She remains in a critical condition in hospital.
The Police Service of Northern Ireland launched a murder investigation into the incident on Friday night.
Detective Chief Inspector Geoff Boyce said two men entered a property on the road at around 7.30pm on Friday and fatally shot Mr Boylan.
“A motive for the incident has not yet been established and I am appealing for information,” he said.
“I would particularly like to hear from anyone who was in the area last night and who may have seen two men or any vehicles fleeing from the scene immediately after the shooting.”
South Down Assembly member Sinead Ennis also appealed for information.
“The community of Warrenpoint are shocked and stunned by this news,” the Sinn Fein representative said.
“Our first thoughts are with the family of the victim.
“The PSNI have the area sealed off and I would appeal to anyone with information to bring it forward to assist the investigation.”
It is understood the shooting happened inside a house near a golf club.
Police urged anyone with information to call 101 or the independent charity Crimestoppers on 0800 555 111.