Danish 15-year-old Lisa Borch slaughtered her mother Tina Römer Holtegaard after bingeing on horrific Islamic State (ISIS/ISIL) beheading videos, a court has heard. She was convicted, as was her 29-year-old Muslim boyfriend.

The blonde teenager with piercing blue eyes submerged herself in radical Islam after she fell in love with an extremist. He left her to move to Sweden, but another man, 29-year-old Abdulla who resided at a refugee centre, swept in and stole her heart.

Holtegaard begged her young daughter to dump the older man and “live the life of a normal teenager.” Borch’s twin sister moved out of the house because of the fighting.

Borch’s twin sister said she showed her “the knife she said she was going to kill her mum with, but thought she was just joking.”

“This murder was cold blooded, ice cold and committed in a bestial manner,” said prosecutor Karina Skou.

In October, police received a frantic call from Borch.

“I heard my mother scream and I looked out the window and saw a white man running away,” she screamed. “Please come here, there is blood everywhere.”

Police arrived only to find Borch sitting in the “living room room with her iPhone and watching videos on YouTube.” The police asked about her mother and the young girl “simply pointed upstairs.” That action alone set off red flags with the police. Officers discovered Holtegaard on her bed covered in blood after someone stabbed her at least 20 times.

Authorities confiscated Borch’s computer, which showed the teenager had repeatedly watched videos of ISIS beheadings. They also discovered she planned to run awat to Syria with Abdulla and join ISIS.

The lovers blamed each other in court. Abdulla insisted he was only there to help her after the murder. Borch declared Abdulla performed the murder. He was nowhere near the house when police arrived, but forensics found his fingerprints in the bedroom. From The Mirror:

The court was unable to rule which of the pair delivered the fatal wounds, however they were both convicted of murder.

Borch was sentenced to nine years, the first of which will be spent in a young offenders institution.

The following eight years will be in jail.

Her boyfriend Abdulla received 13 years, and when his sentence expires he will be expelled from Denmark.

The court ordered the pair “to pay £40,000 ($61,329.80) in compensation to Mrs. Holtergaard’s husband – Borch’s stepfather – as well as her twin sister and a younger brother.” The stepfather was out of town during the murder.