The body of 53-year-old Martin Mulligan was found last September
A 22-year-old man is being questioned over the murder of a taxi driver in County Louth last year.
The body of 53-year-old Martin Mulligan was found on a road at Carnmore, on the Armagh Road outside Dundalk, in the early hours of September 28th last.
A post-mortem found he died of stab wounds to the abdomen and right thigh.
Yesterday evening Gardai arrested a man in Dundalk in connection with his murder.
He is being held at Dundalk garda station under Section 4 of the Criminal Justice Act and can be held for up to 24 hours.