A top forensic scientist has detailed how she discovered the blood DNA evidence which helped to solve the infamous Scissor Sisters murder.
A new RTE Scannal documentary is set to cast the spotlight on one of the most gruesome cases in Irish criminal history.
In 2006, Dublin mother-of-four Linda Mulhall received a 15-year sentence for manslaughter, while her sister Charlotte was given a life sentence for the murder of 39-year-old Kenyan immigrant Farah Swaleh Noor.
The case caused deep revulsion when it was revealed his body had been dismembered in the aftermath of the killing at their mother's home in Richmond Cottages off Dublin's North Strand.
Dr Martina McBride, from Forensic Science Ireland, recalled being called out to Dublin's Royal Canal by gardai in March 2005 after a passer-by spotted Noor's dismembered leg floating in the water.
"At first, I saw a hand and foot in the water. There was a sock on the foot. Gardai said a lot people had seen the body parts," she told RTE's Scannal.
"They thought it was a mannequin.
"Once it had been confirmed it was Farah Noor, the gardai were able to go to his home. He was living with Kathleen Mulhall."
The forensic scientist described how she found his blood all over their home.
"I forensically examined the bedroom with the gardai and after only a short while we noticed blood drops all over the room," she said.
"There are traces of blood on the wall and on the carpet and on the furniture.
"At the end of the examination we use luminol. Luminol reacts with blood, it works very well on old blood or blood that has been cleaned up.
"It casts a fluorescent whenever blood is present. When we carried out a DNA profile on the blood in the bedroom we were able to confirm it was Farah Swaleh Noor's DNA."
The documentary details how Kathleen Mulhall, who was 52 at the time, was in a relationship with her much younger boyfriend for three years after meeting him in a nightclub in Tallaght in 2001.
It was described as a relationship fraught with violence, leading to her being hospitalised on numerous occasions due to beatings she had received at Noor's hands.
Her previous relationship, her 29-year-old marriage to husband John Mulhall, was also described as abusive.
The documentary detailed how Linda Mulhall told gardai that they had killed Noor because he made sexual advances toward her.
Forensic psychologist Dr Ciara Stanton told the RTE documentary that the dismemberment of his body was telling.
"The decapitation and the removal of the penis signify something very symbolic, something which could be deeply subconscious," said the UCC lecturer on the psychology of criminal behaviour.
"The removal of the head is almost like the removal of the torment, the constant verbal abuse."
Scannal will be shown on RTE One tomorrow at 8pm