Gardaí in Dublin have released two men arrested yesterday in connection with the murder of Latvian woman Baiba Saulite last year.
The pair, one Irishman and one foreign national, were detained at Mountoy Prison, where they are both serving jail terms.
Gardaí say they have now been returned to their cells.
Meanwhile, a third man who was also arrested yesterday is still being questioned this morning.
Ms Saulite, a 28-year-old mother-of-two, was shot dead in the dooorway of her home in Swords last November in what gardaí believe was a contract killing.