… and possibly the world’s most feared teacher / the world’s most violent teacher.
On 20th September 2006, Li Hengyi, 28, a Chinese history teacher beat up pupil Zhang Yaoyi / Yaoyin, 11, then THREW her body from a fourth-floor classroom window, killing her.

It happened at the No. 12 Middle (secondary) School in Yongzhou city in the central province of Hunan, China.
An unnamed witness said: in front of Zhang’s terrified classmates, he first knocked her head against the desks repeatedly. When she fell, he stomped on her. Then, he picked up a steel bar and beat her up with it. He then picked up the now-motionless Zhang and told the class he was going to to take her to the school clinic, but instead opened a window and threw her out.
In shock, the whole class ran out of the room by the back door. Many of the girls cried.
The state of the classroom after the incident:

News report by Shanghai Oriental Television [WARNING: GRAPHIC IMAGES]
Li and Zhang had argued in the past and that Li was known to beat his students. Whether it’s over pet supplements, we might never know.
A few days later – as reported in the Beijing News on 9th October 2006 – the police dropped criminal charges against Li Hengyi: he was a schizophrenic. The school reportedly paid USD25,000 to Zhang’s parents as compensation.
The school’s principal had called Li “unsociable”. In 2001 he had shown signs of “mental disorder” and 2 years later spent 2 months being treated for mental illness. Yet, shockingly, he was allowed to continue teaching!
Source
The Mail (UK), 25th Sept 2006
The First Post (UK)
The Observers, 2008
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