A 16-year-old boy who stabbed teacher Ann Maguire to death in a "monumental act of cowardice and evil" has been warned he may never be released from prison by a judge who found his pride and lack of remorse in his actions "truly grotesque".
Mr Justice Coulson told Will Cornick, who stabbed Mrs Maguire (61) seven times from behind as she taught a class at Corpus Christi Catholic College in Leeds in April, that he must serve at least 20 years in custody before he is ever considered for release.
But he warned the boy, who was 15 when he killed his Spanish teacher, that, having read about him, "it's quite possible that day may never come".
The court heard how the teenager held a deep hatred of Mrs Maguire and had planned her murder, telling many of his friends of his desire to kill her.
After the murder he told experts that he "couldn't give a s***'' and added: ''Everything I've done is fine and dandy.''
In a shocking attack, Cornick winked at another boy before he launched into a savage assault in front of a terrified class full of pupils.
Mrs Maguire was left with stab wounds as bad as any the paramedic who attended had ever seen, including one wound which went straight through her neck and another that cut her jugular vein.
Despite this, the teacher managed to leave the classroom, pursued by the boy until a colleague bundled her into a room and held the door shut.
Leeds Crown Court heard how the boy went back into the classroom, sat down and said "good times" in front of his traumatised classmates.
Teachers and police who detained him said he showed a bizarre calmness which continued as he was assessed by a range of experts. The court heard he has never shown any remorse and has spoken of his pride in what he has done.
When he was sentenced today, as with when he was stabbing Mrs Maguire to death, he showed no emotion.
The boy, who the court heard came from a loving and supportive family, had also talked of attacking other school staff, including a pregnant woman "so as to kill her unborn child''.
Outlining the case, prosecutor Paul Greaney said the boy was in Mrs Maguire's Spanish class and his academic reports "had generally been positive''.
He said there was nothing to indicate to the boy's parents or teachers a risk of "homicidal violence''.
But, he said, pupils noticed disturbing aspects to his personality.
The boy told other children that he hated Mrs Maguire and wanted her dead.
The prosecutor said: "Late on the night of Christmas Eve 2013 and into the early hours of Christmas Day, the defendant exchanged messages with a friend.
"He spoke of 'brutally killing' Mrs Maguire and spending the rest of his life in jail so as not to have to worry about life or money.''
Two months before the murder, the boy sent a message on Facebook which said of Mrs Maguire: "The one absolute f****** bitch that deserves more than death, more than pain torture and more than anything that we can understand.''
The boy told a psychiatrist how he planned the murder. The prosecutor said he took a bottle of whisky to school to celebrate after the attack.
Mr Greaney told the court that the defendant said to the expert: "I decided on Sunday it was going to be a knife. I thought I was just going to go to school and wait for her lesson and do it.
Mr Greaney said: "Mrs Maguire was at her desk helping pupils. She was leaning over, looking at the work of a girl...''
"The defendant approached his teacher and began to stab her in the neck and back. He attacked her from behind," he said.