His mother says she has welcomed the development
A man aged in his early 50s has been arrested by gardaí investigating a murder in Co Monaghan in 2007.
Paul Quinn was beaten to death at a barn in Tullycora, Castleblayney on October 20th that year.
His family believe he was killed by the IRA.
The man arrested this morning is being detained at Carrickmacross garda station.
Gardaí say a search of lands near Castleblayney is also being carried out as part of the investigation.
His mother, Briege Quinn, told Newstalk Lunchtime she has a mixture of emotions today.