“The night times are most difficult as she wakes two to three times and has difficulty breathing,” she said.

She also said her youngest daughter had been very upset by her elder sister’s disappearance from the family scene.

The school surrounded by working farms has about 300 students in its pre-kindergarten to sixth-grade classrooms.

About 90 percent of the students are white, according to state records.

“You said you had a dream that your partner was being unfaithful so you attacked her,” he told the defendant.

“That highlights just how seriously warped you are in your approach to relationships.” In her victim impact statement, the victim’s mother said she or one of her sisters would regularly sleep next to her to help her through the nightmares.

The teenage victims in 2015 were all male, most were from black and minority ethnic (BME) backgrounds and many were just 17 or 18 years old.

A boy of 15 and a 16-year-old are also among those whose lives were taken this year.

Overall, 2,668 of the participants had data on bullying and depression as well as other factors that may have caused depression - such as previous bullying in childhood, mental and behavioural problems, family set-up and stressful life events.

These are the faces of the 15 teenagers whose lives were claimed by knife crime in London last year.

The ex-girlfriend’s mother faced Sorrentino across a packed courtroom at Chester Crown Court on Thursday to read her victim impact statement from the witness box.

Staring defiantly at her daughter’s tormentor, she said her “beautiful, bubbly teenager” had broken off ties with the family as she genuinely believed his threats that he would kill them all.

Judge Steven Everett praised the victim’s mother’s courage and described the defendant as a “highly dangerous individual” who manipulated and controlled his girlfriend, now 19.