The PSNI has been asked to help gardai in the Republic after a taxi driver was found murdered on a road just across the border.
Named locally as Martin Mulligan, a father of two daughters and from Dundalk, he is believed to have been attacked and stabbed a few miles outside the town.
A woman who had been travelling along the R177 road shortly after 3am discovered his body and alerted gardai.
Mr Mulligan was from Lower Point Road in Dundalk and was a well-known independent taxi driver.
The crime scene was in an area known as Kilcurry on what locals call the Armagh Road and only a mile from the border and a few miles from Dundalk town centre.
The spot is also near where the Republic's main Belfast-Dublin M1 motorway crosses overhead.
Mr Mulligan's car, a Louth-registered Skoda Octavia with a taxi roof sign, was found a short distance away from where his body was discovered. The taxi was parked just off the road.
Family members visited the scene yesterday morning as news began to filter through of the violent death. Two cars, one of which was the taxi man's, were taken from the scene of the killing for further forensic tests.
The road where Mr Mulligan's body was found is a popular route north from Dundalk into south Armagh.
Gardai said Mr Mulligan's cab was parked a few yards in on a right turn just off the Armagh Road heading north, near the townlands of Carn More and Kilcurry.
His body was found about 200m-300m away on the road.
Superintendent Gerry Curley, from Dundalk Garda Station, described the victim as a family man and appealed for witnesses.
"He was a family man, a local man, a hard-working man in the Dundalk area," the officer said.
"We are satisfied it was a violent death.
"We will be seeking assistance from the Police Service of Northern Ireland, as it is close to the border."
Suspected involvement of Provisional IRA is not a line of inquiry.