The jury heard that he wanted revenge and when Elianne snatched a bag with his belongings in, he chased her down and stabbed her multiple times.

Prosecutor Alex Chalk KC said: “He was angry on 27 September, having brooded on the insult and he took the knife to the scene to reassert dominance.

“He exacted vengeance on a young girl clearly running away from him and posing no threat.”

Elianne suffered a fatal 12cm deep stab to the neck and a passing bus driver held her hand and stayed with her as she lay dying in the street.

Sentamu was diagnosed with autism spectrum disorder when he was 14.

He spent some of his teenage years in foster care, in a pupil referral unit and in a special educational needs school.

The court heard he had a troubled and disruptive childhood, with reports of self-harm, suicidal thoughts and violent behaviour with knives.