Two Garda detectives are in the US tracking the chief suspect in the murder case of fellow Det Gda Adrian Donohoe.
Originally from Kilnaleck, Det Gda Donohoe, 41, was shot and killed during a botched robbery by a gang of thugs in Louth on January 25.
Gardai have been on the chief suspect's trail since. He is thought to be in his 20s and from Armagh and fled the country in April.
The suspect is believed to have been the trigger man and has taken up residence on the east coast but is already under surveillance.
It is thought the chief suspect, who is not the gang leader, is on a three-month visa.