Leeds Crown Court heard he sent a Facebook message weeks before the killing, which said of Mrs Maguire: The teenager stabbed Mrs Maguire as she taught a class at Corpus Christi Catholic College, in Leeds, in April, 2014, when he was 15.
"The one absolute fucking bitch that deserves more than death, more than pain and more than anything that we can understand.
During psychiatric evaluation, he said..
"I wasn't in shock, I was happy. I had a sense of pride. I still do'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. I wanted to get caught. That's why I did it in school. I wanted to be in jail.’
"I know it's uncivilised but I know it's incredibly instinctual and human. Past generations of life, killing is a route of survival. It's kill or be killed. I did not have a choice. It was kill her or suicide. ‘I know the victim's family will be upset but I don't care. In my eyes, everything I've done is fine and dandy.’
According to DailyMailUk, He had brought a bottle of whisky to school to celebrate after the attack, and had winked at a fellow pupil before starting to stab Mrs Maguire.
The prosecutor said 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. Ann Maguire was 61 years of age, 5ft 2in in height and of slim build. The defendant was a full foot taller and was armed with a large kitchen knife. To describe his attack as cowardly hardly does it justice.’ Mrs Maguire fled but she was chased by the boy ‘stabbing her as she sought to escape’.
"Mrs Maguire ran towards her feiend Mrs Francis, holding her neck and saying: ‘He's stabbed me in the neck.’. Mrs Francis pushed her friend into a work room and held her foot against the door to keep the boy out. She was able to see (the boy) through a glass panel in the door. His face was emotionless and he then walked away.
’He sat down beside...as if nothing had happened and said that he had stabbed Mrs Maguire. He added that it was a pity she was not dead. He said to the entire class "good times" and spoke of an adrenalin rush.
"Undoubtedly, one of the most disturbing aspects of an extremely disturbing case is that (the boy) not only lacks remorse but is proud of what he did in killing Mrs Maguire, who he at one stage described to (a psychiatrist) as barely human.’
"That his anger and hatred in fact became focused upon a person as decent and loved as Ann Maguire only makes this case the more tragic and goes to explain the outpouring of grief that there has been within the school and within the community.’
The boy was said to have had a good family background with 'decent and responsible parents'
Mr Justice Coulson - who said the boy may never be released - said he showed a 'chilling lack of remorse' over the attack..
He set the 20-year tariff - the minimum time the boy must serve in custody before he is released - but added that, after reading about him, 'it's quite possible that day may never come'.
The boy - cannot be named for legal reasons.
