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Grewal said he went back to sleep but, according to authorities, Cho stayed awake.

In fewer than five hours, Cho was dead, having killed himself after shooting 32 others to death at two locations on the Blue Ridge Mountain campus.

"He did not seem like a guy that's capable of anything like this," Grewal said.

A day after the deadliest gun massacre in modern U.S.

history, students, friends and officials were trying to understand how Cho, a 23-year-old senior who was majoring in English, came to kill.

It was a hazy picture of a man whose last note was a rant against rich kids and debauchery, but who also appeared organized enough to secure weapons and stage his rampage.

According to school officials, Cho even had time to post a deadly warning on a school online forum.

"im going to kill people at vtech today," they said he wrote.

The validity of the quote could not be independently verified.

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