Two men arrested over the murder of Baiba Saulite remain in custody today.
The men are being questioned in Malahide and Coolock Garda stations in Dublin. Both men are in their early 40s and were arrested at their homes in Allenwood, Co Kildare and Coolock yesterday.
They are suspected of withholding information in relation to the killing.
Gardaí investigating the murder issued a fresh appeal for information on the killing of the Latvian mother-of-two a year ago.
Detectives believe Ms Saulite was murdered by a man known to her. The chief suspect is involved in organised crime, and detectives believe he paid other criminals to kill the Ms Saulite (28).
She was shot dead in the hallway of her home in Holywell Square, Feltrim Road, Swords, on Sunday, November 19th, 2006.
Her two young sons - Ali-Alexsandra (5) and Mohamed Rami (3) - were asleep in the house at the time. Ms Saulite was buried in her native Riga in December last year.
Ms Saulite had been threatened and was in constant contact with gardaí, and her solicitor had been given Garda protection in the weeks before her killing.
He went abroad for safety reasons for a short period after the murder. He returned to work at his legal practice before the end of last year but remains under armed Garda protection.
Gardaí in Swords can be contacted at (01) 6664700. Anybody with information can also contact the Garda Confidential Line on 1800-666111 or Crime Stoppers on 1800-250025.