The teenager who murdered teacher Ann Maguire has been named as 16-year-old Will Cornick.
A judge at Leeds Crown Court lifted a court order previously banning the naming of the minor.
The boy was sentenced to life with a minimum of 20 years after admitting the murder of Mrs Maguire.
Ann Maguire's sisters read a statement outside court following the sentencing of her 16-year-old killer.
Shelagh Connor said: "The joy of living her life and the fulfillment of her hopes and dreams and passions have disappeared with this horrific, cruel, senseless and cowardly act."
Denise Courtney said: "We shall never recover from this pain and anguish.
"No amount of punishment can ever compensate for the loss of Ann's life."
The judge who presided over the Ann Maguire murder trial has slammed 'ill-informed commentators' who criticised him for naming Will Cornick.
A teenager who has admitted murdering his teacher came from a loving home and was thought of as a good student and in many ways normal.
Ann Maguire was just months away from retirement when she was stabbed to death in front of horrified pupils at a school in Leeds.