Virginia Tech Update

There is a new update about the killer ... an interview with his former roommates and A professor's report about his anger ....


BLACKSBURG, Virginia (CNN) -- Long before before Cho Seung-Hui's deadly shooting spree on the Virginia Tech campus, a professor was so concerned about his anger that she took him out of another instructor's class and taught him one-on-one.

The former chairwoman of Virginia Tech's English department, Lucinda Roy, said the anger Cho expressed in the fall 2005 creative writing course was palpable if not explicit.

Two of Cho's former roommates also described his behavior as unusual, saying that he had spoken of suicide and had stalked three women. (Watch Cho's roommates describe his "crazy" behavior )

Authorities confirmed that Cho had been investigated last year for stalking a woman in person and by e-mail.

As disturbing details emerged about the resident alien from South Korea, students gathered by the thousands in the heart of their campus Tuesday night for a candlelight vigil.

The students and victims' relatives gathered on Tech's drill field, holding candles aloft against the chilly night. Though the vigil was primarily solemn, students broke out in chants -- "Hokies, Hokies, Hokies" -- in a show unity and determination.

Roy, meanwhile, said the writings by Cho, an English major, were disturbing enough that she went to police and other university officials to seek help. (Watch the professor tell how her student frightened her )

"The threats seemed to be underneath the surface," she said. "They were not explicit, and that was the difficulty the police had."

His instructor and fellow students also found his behavior in class "inappropriate," Roy said.

"He was taking photographs of students without their permission, especially under the desk," she said.

But without a clear threat nothing could be done, and Roy made the decision to instruct him away from other students.

Police say Cho killed at least 30 people and wounded 17 others before killing himself in Norris Hall, an engineering classroom building, Monday.

According to a search warrant, police found a note in Norris Hall containing a bomb threat directed at engineering buildings on the campus.

Two other bomb threats received in recent weeks were also being investigated. (Watch how the note threatens engineering buildings)

It's also believed the 23-year-old student killed two other people earlier that day in a dormitory on campus.

Virginia Tech Police Chief Wendell Flinchum said ballistics tests show that one of the two guns recovered at Norris Hall was used at the dorm.

Full details....