A schizophrenic who knifed a schoolboy to death and wounded three other pupils after failing to take his medication was today jailed for at least 20 years.

Serif Aslan stabbed Kasey Gordon, 15, in the heart in front of horrified shoppers. Aslan, 34, who was free to roam the streets despite a long history of mental illness, had missed his vital anti-psychotic medication for up to a week before the daylight attack in Tottenham on January 20 last year .

He launched his assault after being caught leering at a schoolgirl — using a blade he had stashed in his room at a care home. He then strolled away, leaving Kasey bleeding to death on the pavement and two of his friends with serious chest and hip injuries. A fourth boy had superficial cuts to his face and hand.

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