Mark Nash has been found guilty of murdering two women in Grangegorman in Dublin 18 years ago.
The 42 year old had denied stabbing 59-year-old Sylvia Shiels and 61-year-old Mary Callinan to death while they slept in their beds.
Nash, who is originally from England, is already serving life in prison for murdering his ex-girlfriend's sister and her husband in Roscommon - also in 1997.
When arrested for those murders he admitted to the Grangegorman killings, but later withdrew his confession.
Nicola Tallant - Investigations Editor with The Sunday World - says the two women died in horrific circumstances:
