The former chairwoman of Virginia Tech's English department was so concerned about Cho Seung-Hui's anger in the fall of 2005 that she took him out of a creative writing class and taught him one-on-one.
Lucinda Roy said Tuesday that police had asked her not to discuss details of the Virginia Tech shooter's writings because of the ongoing investigation, but she said the anger he expressed was palpable.
Police say Cho was the student who killed at least 30 people and wounded 17 others before killing himself Tuesday in an engineering classroom building.
It's also believed he killed two other people earlier Monday in a dormitory on campus, but police are not yet willing to say so definitively. (Watch how some are asking why warnings weren't issued sooner )
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.
"It certainly is reasonable for us to assume that Cho was the shooter in both places, but we don't have the evidence to take us there at this particular point in time," State Police Superintendent Col. W. Steven Flaherty said. (Watch what police were looking for in Cho's room )
Cho never wrote about guns, Roy said, or killing people -- but his writing was disturbing enough that she went to police and other university officials to seek help.
"The threats seemed to be underneath the surface," she said. "They were not explicit, and that was the difficulty the police had."
"My argument was that he seemed so disturbed that we needed to do something about this."
Without a clear threat, nothing could be done, however, and Roy made the decision to take him on in a one-on-one setting.
"I just felt I was between a rock and a hard place," she said. "It seemed the only alternative was to send him back to the classroom, and I wouldn't do it."
While teaching Cho one-on-one, Roy said she "made it clear that that kind of writing was unacceptable and he needed to write in another voice."
And, she said, he appeared to do much better under her close tutelage.
"We worked hard, and I think he produced some writing that I think he could be proud of," she said.
She also said that she encouraged Cho to go to counseling, and believed that he may have "gotten tired of hearing it" and begun to tell her he had been going when, perhaps, he had not.
Cho was an intelligent student, Roy said, but he left students and professors alike unnerved in his presence.
"He always wore sunglasses, even inside," she said. "And he had a hat on, a cap, maybe a baseball cap. You couldn't really see his face. ... It was intimidating, I think."
A fellow student said Cho had written two plays so "twisted" that his classmates suspected he might become a school shooter.
Ian McFarlane, who said he had class with Cho, called the plays "very graphic" and "extremely disturbing."
McFarlane provided a copy of the writings to AOL where he is an employee. (Read McFarlane's blog and the two plays )
"It was like something out of a nightmare," McFarlane wrote in a blog. "The plays had really twisted, macabre violence that used weapons I wouldn't have even thought of.
"Before Cho got to class that day, we students were talking to each other with serious worry about whether he could be a school shooter."
Cho paid $571 for a 9 mm Glock 19 pistol just over a month ago, the owner of Roanoke Firearms told CNN Tuesday. He also used a .22-caliber Walther pistol in the attack, police said. (Interactive: The weapons used in the shootings)
John Markell said Cho was very low-key when he purchased the Glock and 50 rounds of ammunition with a credit card in an "unremarkable" purchase.
Cho presented three forms of identification and did not say why he wanted the gun, Markell said. (Watch how quickly these guns can be fired, reloaded )
State police conducted an instant background check that probably took about a minute, the store owner said.
Markell said he was shocked when three agents from the Bureau of Alcohol Tobacco and Firearms arrived at his store Monday with the receipt for the weapon.
Governor not ready to talk gun control
Virginia Gov. Tim Kaine said he wasn't interested in arguments about gun control.
"People who want to take this within 24 hours of the event and make it their political hobby horse to ride, I've got nothing but loathing for them," Kaine said at a Tuesday evening news conference.
"To those who want to try to make this into some little crusade, I say: Take that elsewhere. Let this community deal with grieving individuals and be sensitive to those needs."
Shooter's note
Flaherty said Cho apparently did not leave a suicide note. (Watch Flaherty describe the scene after the shootings )
However, ABC News reported that other law enforcement sources said Cho did leave some kind of note in his dorm room. It contained an explanation of his actions and states, "You caused me to do this," ABC News reported.
It also railed against "rich kids," "debauchery" and "deceitful charlatans" on campus, according to the Chicago Tribune. (Note: Cho Angry at "rich kids")
Authorities are still investigating whether Cho had any accomplices in planning or executing Monday's rampage, Flaherty said.
Cho, a resident alien from South Korea, was a 23-year-old English major who lived at the university's Harper Hall, Flinchum said.
"He was a loner, and we're having difficulty finding information about him," said Larry Hincker, associate vice president for university relations.
Cho came to the United States in 1992, through Detroit, Michigan, a department of Homeland Security official said. He had lawful permanent residence, via his parents, and renewed his green card in October 2003, the official said.
His residence was listed as Centreville, Virginia, a suburb of Washington, D.C.
Doctor recalls 'amazing' injuries
A doctor at a Blacksburg hospital described the injuries he saw Monday as "amazing" and the shooter as "brutal."
"There wasn't a shooting victim that didn't have less than three bullet wounds in them," said Dr. Joseph Cacioppo of Montgomery Regional Hospital. (Doctor: "This man was brutal")
As questions continued to arise about how police reacted to the first shooting at the dorm, university President Charles Steger on Tuesday defended the response, saying police believed it to be "a domestic fight, perhaps a murder-suicide" that was contained to one dorm room.
Police cordoned off the 895-student West Ambler Johnston dorm and all residents were told about the shooting as police looked for witnesses, Steger said.
Authorities were still investigating what they believed was an "isolated incident" when the slaughter started at Norris Hall.
"I don't think anyone could have predicted that another event was going to take place two hours later," Steger said, adding that it would've been difficult to warn every student because most were off campus at the time. (Watch a student's recording of police responding to loud bangs )
Student heard clip drop to ground
Zach Petkewicz was in class when the shooting at Norris began and "everyone went into a frenzy, a panic." Petkewicz was hiding behind a podium when he realized there was nothing preventing the shooter from entering the classroom and barked to his classmates, "We need to barricade this door." (Watch how Petkewicz's quick thinking may have saved lives )
Two students joined him in throwing tables against the door and wedging their weight behind them, just as the gunman cracked open the door.
When the students slammed the door in his face, "he backed up and shot twice into the middle of the door thinking we were up against it," Petkewicz said.
"I was up against the side holding this desk up against there and I just heard his clip drop to the ground and he reloaded, and I thought he was coming back for a second round, to try and get his way in there," he said. "He didn't say a word, and he just turned and kept firing down the hall and didn't try to get back in."
As of midday Tuesday, officials were still releasing the names of those killed, which include a marching band member from Georgia and an Israeli Holocaust survivor who headed the engineering and science department. (Friends, family recall victims)
Classes have been canceled for the rest of the week, and Norris Hall will be closed for the remainder of the semester, Steger said. Emily Alderman, who works at a clothing store near campus, said students were sending out instant messages urging one another to wear their Virginia Tech Hokie gear in a sign of unity.
The rest of spring football season also has been canceled, the university announced.
There have been two bomb threats at the university this month, the latest of which came Friday. Flinchum said Tuesday they were unrelated to the shootings.