Further tests, including a toxicology report, are due to be carried out on the bodies of a couple found dead at a farmhouse in Limerick yesterday morning.
Post-mortem examinations were conducted on the bodies yesterday evening, however it was not possible to determine the cause of death.
The length of time the bodies were in the house is a contributory complicating factor.
The couple are last believed to have been seen on 14 March.
The two have been named locally as Julia Holmes, 63, and her partner Thomas Ruttle, aged in his 50s.
However gardaí wish to stress that there has been no positive identification of either of the deceased and efforts to identify them are ongoing.
The couple were found at around 3am in an upstairs bedroom of the house at Boolaglass, Askeaton, after gardaí were contacted with information directing them to go there.
It is understood Thomas Ruttle had access to a rifle and a shotgun, both of which are understood to have been recovered from the house.
One of the lines of inquiry understood to be followed by gardaí is that they died by murder-suicide.
It is believed that Ms Holmes had moved to the house, which was owned by Mr Ruttle, in recent months.
She was wanted by the PSNI in connection with a number of fraud investigations, but had used a number of aliases in the past.
Gardaí have appealed to anyone who may have seen the couple since 14 March to contact Newcastle West Garda Station on 069-20650, the Garda Confidential line on 1800-666111 or any garda station.