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... A NATION ASKS WHY / THE KILLER: Senior isolated himself from other students, worried teacher with his writings' content, barely hid his anger SFGate Home Business Sports Entertainment Travel Classifieds Jobs Real Estate Cars SFGate Web by A NATION ASKS WHY THE KILLER: Senior isolated himself from other students, worried teacher with his writings' content, barely hid his anger Manny Fernandez, Marc Santora, New York Times Wednesday, April 18, 2007 Printable Version Email This Article del.icio.us Digg Technorati Reddit Slashdot Fark Newsvine Google Bookmarks Georgia (default) Verdana Times New Roman Arial (04-18) 04:00 PDT Blacksburg, Va.

- Cho Seung-Hui rarely spoke to his own dormitory roommate.

His teachers were so disturbed by some of his writing that they referred him to counseling.

And when Cho finally and horrifyingly came to the world's attention on Monday, he did so after writing a note that bitterly lashed out at his fellow students for what he deemed their moral decline.

Cho's eruption of violence, in which 32 victims were killed on the Virginia Tech campus in a rampage of gunfire, was never directly signaled by his actions or words, several of his acquaintances said Tuesday.

But those acquaintances were frequently disturbed by his isola...

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