Trees are tied with ribbons of Virgina Tech school colors, orange and crimson, on April 20, 2007, on the campus of Virginia Tech University in Blacksburg, Virginia. Thirty-two students and teachers were shot dead on the university campus by a student, who later killed himself.
- [Tim Sloan/AFP/Getty Images]

South Koreans participate in a candle light vigil in memory of the victims of the Virginia Tech University shootings on April 18, 2007 in Seoul, South Korea. South Korea expressed shock after learning that a South Korean-born man was to blame for the university massacre.
- [Chung Sung-Jun/AFP/Getty Images]

Sophomores Heather Stogdale, 20, Heidi Dull, 19, and Anne Carlisle Strole, 19, all of Stanton, Virgina, stop to mourn at a makeshift memorial on the campus of Virginia Tech where a day earlier 33 people were shot and killed April 17, 2007 in Blacksburg, Virginia.
- [Chip Somodevilla/AFP/Getty Images]

A yellow rose rests against a memorial signed by Virginia Tech students and visitors on the Drill Field on the university's campus April 18, 2007, in Blacksburg, Virgina.
- [Win McNamee/AFP/Getty Images]

South Korean activists pay silent tribute to the victims of the Virginia Tech shootings April 18, 2007, in Seoul, South Korea.
- [Chung Sung-Jun/AFP/Getty Images]