Ella Porter, now aged 18, was just 10 months old when her father, Mark Nash, stabbed a sleeping man to death as she lay nearby in a house Ballintober, Co Roscommon, in August 1997.
Nash was last month found guilty of the murders of 59-year-old Sylvia Sheils and 61-year-old Mary Callinan in sheltered accommodation in Grangegorman, Dublin, in March 1997.
He was already serving life sentences for the murders of his then girlfriend’s sister and her husband in Roscommon.
During the Roscommon murders, Nash attacked his then girlfriend Sarah Jane Doyle and stabbed her sister, Catherine Doyle, to death.
He killed Catherine’s husband, Carl Doyle, while Ella slept in the same room.
Nash stabbed Catherine 16 times and Carl six times in the heart.
He left the scene, leaving his daughter and five other children in the house. Sarah Jane Doyle, who Nash hit over the head with a stove handle and pushed down the stairs, survived the ordeal by pretending to be dead.
Ella, Nash’s child from a previous relationship, said in an interview with the Daily Star that her mother, Lucy Porter, fled to Britain with her in the wake of the Roscommon murders.
Ella said she learned who her father was when she was 14.
“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,” she said.
“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?
“I just want to know what brought him to think he could do that and get away with it. I do think he’s a monster.”