Police: Cho Stalked 2 Women In 2005
Two Women Complained, But Failed To Press Charges; He Then Went To Mental Health Agency
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Play CBS Video Video Gunman's Classmate Speaks Out Harry Smith speaks to Sara Stevens, who attended a writing class with Virginia Tech gunman Cho Seung-Hui during the past three years. Stevens recalls her classmate's "brutal and graphic" plays.
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Video Professor Saw Warning Signs Virginia Tech English professor Lucinda Roy speaks with Harry Smith about her infamous student, gunman Cho Seung-Hui, and how his disturbing writing alerted her to potential problems.
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Video Virginia Tech Mourns Thousands poured into the center of Virginia Tech's campus for a candlelight vigil to begin a period of mourning and to remember the victims of the massacre. Harry Smith reports.
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Crime scene: Norris Hall, a classroom building on Virginia Tech's campus where 30 people were killed Monday, April 16, 2007. (AP Photo/Charles Dharapak)
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Virginia Tech freshman Ryan Fowler, second from right, hugs his dad, Tim, of Mt. Airy, Md., as his mother, MaryEllin, hugs another student near Norris Hall, the site of a shooting on the campus of Virginia Tech in Blacksburg, Va., Monday, April 16, 2007. (AP Photo/Steve Helber)
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A Virginia Tech student visits a makeshift vigil early Tuesday, April 17, 2007, in Blacksburg, Va., to honor the victims of the shootings on the campus Monday. (AP Photo/Casey Templeton)
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Students gather in front of the War Memorial to mourn their fellow students Monday, April 16, 2007, in Blacksburg, Va. (AP/ Sam Dean, The Roanoke Times)
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Cho Seung-Hui, a 23-year-old senior at Virginia Tech, has been described as a loner. Cho committed suicide after killing 32 people and wounding 15 others in the deadliest shooting in U.S. history. (AP Photo/Virginia State Police)
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Interactive Virginia Tech Tragedy Deadly shooting rampage on Virginia Tech campus leaves 33 dead.
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Interactive In Memoriam Profiles of the students and staff who lost their lives in the massacre at Virginia Tech
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Photo Essay Virginia Tech Massacre Gunman opens fire in dorm and classroom, killing at least 32 before killing himself.
Karan Grewal shared a suite with Cho, and saw him just two hours before the massacre started.
"He came in. Looked as normal as usual, no expression on his face. Didn't seem angry, sad, anything. Just a normal look on his face. Just like the picture," Grewal told CBS News.
"He was my roommate," Joe Aust, 19, told The New York Times. "I didn't know him that well, though."
He added: "He was always really, really quiet and kind of weird, keeping to himself all the time," he said. "I tried to make conversation with him in August or so and he would just give one word answers and not try and carry on the conversation."
The emerging portrait of Cho, the quiet loner whose writing sent out alarms, is one that fits almost to a "T" a U.S. Secret Service profile of the typical school shooter, reports CBS News correspondent Wyatt Andrews.
In a study done after the Columbine massacre, the Secret Service studied 37 school shootings to learn the patterns of the school-aged assassins.
Most school attacks, the report said, come from loners with some kind of grievance, adds Andrews. "Many attackers felt bullied," ...or persecuted by others....and "more than half had revenge as a motive."
Cho — who arrived in the United States as boy from South Korea in 1992 and was raised in suburban Washington, D.C., where his parents worked at a dry cleaners — left a note that was found after the bloodbath.
A law enforcement official who read Cho's note described it Tuesday as a typed, eight-page rant against rich kids and religion. The official spoke on condition of anonymity because he was not authorized to speak to the media.
"You caused me to do this," the official quoted the note as saying.
Cho indicated in his letter that the end was near and that there was a deed to be done, the official said. He also expressed disappointment in his own religion, and made several references to Christianity, the official said.
The official said the letter was either found in Cho's dorm room or in his backpack. The backpack was found in the hallway of the classroom building where the shootings happened, and contained several rounds of ammunition, the official said.
Gun store owner John Markell, who sold Cho one of the weapons, described him to CBS News as a "nice, clean-cut college kid." He said he had no suspicions about Cho's purchase, but that it's "just terrible" to learn what the gun was used for.
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Ex-NBA ref Tim Donaghy 
