A young woman has described the moment she discovered at the age of 14 that her dad was one of Ireland's most notorious killers.
Ella Porter (18) said she was close to her mother growing up, but never knew that her father was jailed killer Mark Nash.
English-born Nash is currently serving several life sentences for the 1997 murders of a young couple at their home in Roscommon and the vicious killings of two older women at Grangegorman sheltered accommodation.
Nash left his 10-month-old daughter Ella in the rural Roscommon house on August 16, 1997 after he stabbed Catherine Doyle a total of 16 times, stabbed her husband Carl six times in the heart and left his girlfriend Sarah Jane Doyle for dead after hitting her over the head with a stove handle and pushing her down the stairs.
There were six young children in the house at the time of the killings.
Ella's mother Lucy, who was not in a relationship with Nash at the time, brought her daughter to live in England soon after the murders.
In an exclusive interview with the Irish Daily Star, Ella said she thought she just had a 'deadbeat dad'.
"For the first 14 years I was actually really happy," Ella said.
"It was difficult knowing that all my friends had dad at home who would look after them.
"My granddad was the one who looked after me if my mum wasn't around.
"I never really thought about where [Nash] was," she continued.
"I just figured that he was a deadbeat dad or that he was dead and my mother didn't want to talk about it because it was a bit upsetting for everyone.
"I didn't have any brothers or sisters so it was just me.
"I was very close to my mum - she wanted me to grow up and have a normal childhood."
Ella said when she finally found out who her father was at the age of 14, she was 'shocked'.
After hearing pieces of the story from her mother, Ella's grandfather brought her to Paris and sat her down to tell her the full truth of her father.
"As unreal as it seems that he could have done something so horrible, it felt all the more personal because I was there," she continued.
"He was meant to be looking after me, instead he chose to do all these things to these people and he just left me there alone.
"And that was all the more personal for me, because what kind of father does that to their child?"
Ella told the Irish Daily Star she began counselling after turning to alcohol at the age of 14.
She also said she hasn't ruled out coming to visit her father in prison in Ireland, to confront him about his actions 18 years ago.
"I just want to know what brought him to think he could do that and get away with it," she said.
"I do think he's a monster."
Mark Nash relaxed with a beer at a local table quiz just hours before he brutally murdered two women at their sheltered accommodation in Grangegorman in Dublin nearly twenty years ago.
Just over eighteen years after the discovery of the bodies of Mary Callanan (61) and Sylvia Shiels (60) at Grangegorman, Mark Nash is found guilty of the double murder. Here is a brief timeline of the events leading up to the jury's 'guilty' verdict.