Around 7:15 a.m. EDT (11:15 UTC), Cho allegedly killed two students, Emily J. Hilscher and Ryan C. "Stack" Clark, on the fourth floor of West Ambler Johnston Hall, a high-rise co-educational dormitory.
Police had not positively stated that Cho was the perpetrator of that shooting in addition to the later one, although forensic evidence confirmed that the same gun was used in both shooting incidents.
Within the next two and a half hours, Cho returned to his room to re-arm himself and mailed a package containing pictures, digital video files and documents to NBC News. At approximately 9:45 a.m. EDT (13:45 UTC), Cho then crossed the campus to Norris Hall, a classroom building on the campus where, in a span of nine minutes, Cho shot dozens of people, killing 30 of them.
As police breached area of the building where Cho attacked the faculty and students, Cho committed suicide in Norris 211 with a gunshot to his head. The police identified Cho by matching the fingerprints on the guns used in the shootings with immigration records. Cho's rampage occurred on April 16, 2007, just four days before the 8th anniversary of the Columbine shooting.
Preparation
Weapons
During February and March 2007, Cho began purchasing the weapons that he later used during the killings. On February 2, 2007, Cho purchased his first handgun, a .22 caliber Walther P22 semi-automatic pistol, from TGSCOM Inc., a federally-licensed firearms dealer based in Green Bay, Wisconsin and the operator of the website through which Cho ordered the gun. TGSCOM Inc. shipped the Walther P22 to JND Pawnbrokers in Blacksburg, Virginia, where Cho completed the purchase transaction and picked up the handgun.
Cho bought a second handgun, a 9 mm Glock 19 semiautomatic pistol, on March 13, 2007 from Roanoke Firearms, a licensed gun dealer located in Roanoke, Virginia. Cho was able to pass both background checks and successfully complete both handgun purchases after he presented to the gun dealers his U.S. permanent residency card, his Virginia driver's permit to prove legal age and length of Virginia residence and a checkbook showing his Virginia address, in addition to waiting the required 30-day period between each gun purchase.
He was successful in completing both handgun purchases, even though he failed to disclose on the background questionnaire information about his mental health history leading to court-ordered outpatient treatment at a mental health facility.
On March 22, 2007, Cho purchased two 10-round magazines for the Walther P22 pistol through eBay from Elk Ridge Shooting Supplies in Idaho. Cho purchased additional ammunition magazines from the Wal-Mart and Dick's Sporting Goods stores. Based on a preliminary computer forensics examination of Cho's eBay purchase records, investigators suspect that Cho may have purchased an additional 10-round magazine on March 23, 2007 from another eBay seller who sold gun accessories.
Motive
During the investigation, the police found a note in Cho's room that in which he criticized "rich kids," "debauchery" and "deceitful charlatans." In the note, Cho continued by saying that "you caused me to do this." Early reports also speculated that Cho was obsessed with fellow student Emily Hilscher and became enraged after his romantic overtures were rejected.
During the investigation, law enforcement officials could not find evidence that Cho knew Hilscher or the other students killed during the rampage. According to Heather Haugh, Hilscher's roommate, she also knew of no connection between Hilscher and Cho.
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