A boy who stabbed a jogger in a north London park has been jailed for life.
Elias Cecchetti was electronically tagged at the time of the attack
Elias Cecchetti, 16, was found guilty at the Old Bailey in April of attacking the 39-year-old woman in Clissold Park, Stoke Newington, in December 2003.
He was also convicted of stabbing a man, 17, in Finsbury Park, north London, in September 2003 at another trial at the same court in July.
He was sentenced for both crimes at Maidstone Crown Court and ordered to serve a minimum of four years.
Cecchetti, who went by the street name of Slasher, had 20 convictions for crimes committed between the ages of 13 and 15.
He was electronically tagged at the time he attacked the woman but his curfew was between 1900 BST and 0700 BST and he carried out the stabbing at 1700 BST.
As the teacher jogged in the park, Cecchetti shouted that he was "going to get" her.
When she asked what that meant, he stabbed her five times and was said to have then kicked her where he had stabbed her.
Cecchetti was cleared of attempted murder but the jury found him guilty of wounding with intent to cause grievous bodily harm.
The victim only survived the attack because a doctor, who was walking through the park with her children at the time, treated her.
'Calculating and callous'
Cecchetti was convicted of unlawfully wounding his 17-year-old former friend at an earlier trial.
He narrowly missed the teenager's heart when he stabbed him in the chest after a row over a hat.
Det Chf Insp Ron Scott who led the investigation said: "Elias Cecchetti is without doubt the most dangerous juvenile I have ever encountered in my 28 years of service.
"He has proved to be a calculating and callous individual whose complete disregard for others is extremely disturbing.
"I believe that he lay in wait for a victim in Clissold Park with an intention to harm someone."
Judge Warwick McKinnon sentenced him to life for the attack on the woman and two counts of robbery, and two-and-a-half-year's for the attack on his other victim.
He described Cecchetti as "a person who has shown a propensity to commit almost random acts of violence and in some cases extremely serious acts of violence".