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Students described Cho's descent from campus oddball to chilling loner with a loathing for "rich kids" as he began secretly photographing pupils in class, started going to the gym to "beef up" and had a military-style haircut.
It emerged today that at one stage students were so scared of his behaviour that only seven out of 70 turned up for class, forcing lecturers to give him one-to-one tuition.
One teacher even suggested today he was given A grades because he was so "intimidating and staff wanted to keep him happy".
Nikki Giovanni, who teaches poetry, said she threatened to resign if Cho was not taken out of her class. She said: "I think he liked the idea he was a scary guy. Some people like that. That is how they define themselves. Kids write about murder and suicide all the time. But there was something that made us all pay attention closely.
"Students absolutely would not come into class. They said, 'He is taking photographs of us. We don't know what he is doing. It is very strange'."