Dinner lady murder: The chilling and ‘brutally honest’ interview teen, 15, gave after double killing

The 15-year-old schoolgirl who was today found guilty of the horrific murders of a mother and daughter revealed disturbing details about her crimes during police interviews.

Dinner lady Elizabeth Edwards, 49, and her 13-year-old daughter Katie were stabbed through the throat and smothered by the teenager, who can’t be named because of her age.

In the days after the schoolgirl’s arrest, she revealed disturbing details about the killings, that were described as “cold, calculated and callous” in court.

The 15-year-old girl said her boyfriend had knifed Ms Edwards through the voice box to ensure her daughter was not woken by screams or cries for help.

Although she did not watch Katie being killed, the girl described hearing “moaning” from the younger victim’s bedroom as the male defendant - who also cannot be named - smothered her with a pillow.

Murders: Elizabeth and Kate Edwards were found dead in their home in Spalding (PA)

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The female defendant described the killings as “a breeze” and gave a horrifying account of blood being spattered on a wall and on her boyfriend’s face and hands.

She told police the boy took “spare” clothes to the scene of the murders in a backpack, along with four knives.

In her matter-of-fact admissions to police, the schoolgirl said she and her boyfriend had planned the killings after a conversation which began with them joking suggesting they should murder someone.

Explaining that failed attempts to put the plan into action had taken place on the previous two days, the girl told officers: “We went over the plan over and over again. It just kind of happened.”

Tributes: Friends and neighbours wrote messages to the murdered pair (PA)

After telling police that she witnessed Ms Edwards being killed, the girl told officers that she was shaking by the time her boyfriend entered the younger victim’s bedroom.

She told detectives: ”I heard her say ‘I can’t breathe’ and 'Get off me’.

“He came out of the room with blood on the side of his face, the side of his neck, his jumper and his hands as well.”

After the killings, the girl said, her boyfriend "seemed fine” and they watched the Twilight films, had sex and took a bath for around 20 minutes, opting not to follow their plan and take their own lives.

Police found the bodies of Ms Edwards and her daughter on Friday April 15 this year when three officers forced their way into their house in Dawson Avenue, Spalding.

Both killers face indefinite detention - the juvenile equivalent of a life term for an adult.

Top pic: SWNS