An image that NBC News say they received from Cho Seung-Hui, the shooter in the Virginia Tech shootings, is seen as it is aired on the NBC Nightly News, April 18, 2007. The gunman who went on a deadly rampage at Virginia Tech university this week paused between shootings to mail a rambling account of grievances, photos and videos to NBC, the network said. (Courtesy of NBC News/Handout/Reuters)
NBC News anchorman Brian Williams holds a copy of the envelope that NBC says they received from Cho Seung-Hui, the shooter in the Virginia Tech shootings, in this video frame grab from the NBC Nightly News, April 18, 2007. The gunman who went on a deadly rampage at Virginia Tech university this week paused between shootings to mail a rambling account of grievances, photos and videos to NBC, the network said. (Courtesy of NBC News/Handout/Reuters)
A group of Carnegie Mellon University students and faculty hold a candlelight vigil in memory of those killed at Virginia Tech in the center of campus in Pittsburgh, Wednesday, April 18, 2007. (AP Photo/Gene J. Puskar)