The young woman who sustained horrific burns during an attack on her Co Armagh home has died in a Belfast hospital.
The PSNI has upgraded the investigation to a double murder inquiry following the death of Lisa McClatchey (21) in the Royal Victoria Hospital.
Her partner, Thomas O'Hare (33), died in the same hospital on Friday from his injuries sustained in the same incident.
The couple were attacked on November 6th at their home at Foley Road, Tassagh, near Keady, by a gang of up to six people. Both deceased were beaten with hammers and doused with petrol before being set alight.
Ms McClatchey fled the house and ran to her neighbour's property after the attack with her clothes on fire. Mr O'Hare also left the burning house and was later found lying on fire and suffering from a series of wounds to his limbs and head thought to have been inflicted by a hammer.
Detectives are waiting to interview four brothers from Co Armagh who sought treatment for serious burns at a Dundalk hospital after the attack. They have since been transferred to St James's Hospital, Dublin, where gardaí, working in co-operation with the PSNI, are waiting to interview them.
Senior Garda sources said they believed two other men were involved in the double murder with the four men now in hospital in Dublin. They said these two men drove the four to Dundalk hospital.
The car left at the hospital has already been handed over to the PSNI by gardaí. Garda sources said it was possible the four men would be arrested and questioned in the Republic. They added that the men may even be sent back to the North under the European arrest warrant.
The men's conditions were being closely monitored by gardaí who will interview them when they are well enough.
The PSNI, meanwhile, has said it is following a definite line of inquiry into the south Armagh arson attack. Insp David McConville said yesterday: "I need to speak to anyone who has any information about a dark coloured Vauxhall Vectra car, a Rover 200 series car and a BMW 3-series car in these areas on the evening of Monday, November 6th."
He added: "I also need to speak to the driver of a light-coloured Renault Megane car, the new model, who was in the area of Foley Road around 9pm on the evening of Monday, November 6th."
A 43-year-old man has appeared in court on charges of withholding information and perverting the course of justice.
A lawyer for David Harold Graham, a second-hand car dealer from Omagh, Co Tyrone, said he knew one of the brothers and had lent him the car for a few hours on the evening of the attack. A Belfast court heard on Tuesday that one of the brothers had borrowed a car on November 6th which was later found burned out near the scene.
Lisa McClatchey's family were offered deepest sympathies by SDLP Newry and Armagh Assemblyman Dominic Bradley.
He said: "Our thoughts and prayers go out to Lisa's family and all who knew her at this very difficult time."
Ms McClatchey was related to the late Orange Order leader in Portadown, Harold Gracey.
Armagh councillor Sharon Haughey, who is a cousin of the four brothers being treated for serious burns, also sent her condolences to the McClatcheys.