BLACKSBURG, Va. - Ballistics investigators say one of the guns found after the deadly shooting at the Virginia Tech campus was used in both the shooting at the dorm and at a classroom building.
This morning, Virginia State Police also released the name of the student responsible for yesterday's mass killing at Virginia Tech University.
They say 23-year-old Cho Seung-Hui was a senior English major from South Korea.
33 people died in the shootings, including the gunman, who committed suicide.
Two of the students killed in yesterday's shooting rampage at Virginia Tech had gone to the same Virginia high school as the alleged gunman.
School officials say Reema Samaha and Erin Peterson graduated from Westfield High in 2006 -- three years after Cho. Butauthorities haven't said whether Cho knew the two young women andsingled them out.
Meanwhile, a chilling portrait of Cho as a misfit and sullen loner is emerging. One of his teachers was so disturbed by his creative writing in English class that he was referred to the school's counseling service.
Classmates say that on the first day of a British literature class last year, students took turns introducing themsleves. When it was Cho Seung-Hui's turn to speak, he said nothing.
The professor then looked at the sign-in sheet, and noticed that Cho had written a question mark instead of his name. The professor asked, "Is your name 'Question mark?"' A classmate, Julie Poole, says Cho offered little response.
She says he then spent much of the class sitting in the back of the room, wearing a hat and seldom participating. Even though it was a small English department, she says, Cho remained anonymous, not reaching out to anyone, and not talking.
Poole says, "We just really knew him as the question mark kid."
A gun shop owner in Roanoke, Virginia, says his store sold Cho Seung-Hui a Glock nine-milimeter pistol six weeks ago, along with some practice ammunition.
Authorities found the receipt for that gun in Cho's backpack after yesterday's shooting rampage at Virginia Tech that ended with Cho taking his own life.
John Markell, who owns Roanoke Firearms, says Cho was a "nice, clean-cut college kid." He says, "We won't sell a gun if we have any idea at all that a purchase is suspicious."
Markell says it's "just terrible" to find out that a gun used in yesterday's shootings came from his shop. He says it's not unusual for college kids to make purchases at his shop, as long as they are old enough.