A man was being questioned today about the murder of a taxi driver in Northern Ireland.
Stephen Loughran was stabbed just yards from his home on the Derrybeg Estate in Newry.
The victim, in his early 40s and also known as Stefan, was taken to the Daisy Hill Hospital after the attack last night but died later.
Detectives, who believe he was stabbed at least twice, were investigating claims that Mr Loughran may have intervened in a row.
The scene of the killing, in Fourth Avenue on the estate, was closed off as forensic experts searched for clues.
Public representatives said the community had been stunned by the killing.
Sinn Féin councillor Marian Mathers said Mr Loughran, his wife, Teresa, and their children had lived in the area for some time.
"He was a very quiet, hard-working, family man. People are in shock. This is an awful tragedy for the whole family," Ms Mathers said.