An Irishman arrested in the United States last week by Immigration and Customs Enforcement agents for immigration violations has been deported.

The man, who is in his 20s, is a suspect in the investigation into the murder of Detective Garda Adrian Donohoe in Co Louth almost four-and-a-half years ago.

He arrived in Dublin Airport this morning and was arrested on foot of a bench warrant for a separate matter.

He is wanted in Ireland because he failed to turn up in court after he was convicted of charges in relation to a separate matter.

He is due to be brought before a judge later today.

Gardaí will also seek to question him in connection with the murder of Det Donohoe, who was shot dead while on a cash escort at the Lordship Credit Union in Co Louth on 25 January 2013.