"You had 100 billion chances and ways to avoid today. But you decided to spill my blood," Cho said on the video in the package. "You forced me into a corner and gave me only one option. The decision was yours. Now you have blood on your hands that will never wash off."
Included with the video clips was a 1,800-word diatribe in which he professed admiration for Columbine killers Dylan Klebold and Eric Harris; Cho carried out his rampage on the same week as the Columbine murders were committed in 1999.
Forty-three still photos, 10 of which showed Cho holding handguns, were also included in the package sent to NBC.
Cho then headed to Virginia Tech's engineering building, Norris Hall, where he shot and killed 30 people before taking his own life. Cho fired more than 170 rounds, a shot every three seconds, inside the building where he had once attended class.
In all, Cho's shooting rampage inside the building lasted nine minutes. It took police three minutes to respond to the scene and another five minutes to break through chains that Cho had used to lock the building's three public entrances.
Police heard a final gunshot -- presumably Cho's suicide shot -- before entering one of the four classrooms he targeted and discovering his corpse among some of his 30 Norris Hall victims.
Two handguns were retrieved near Cho's body: a .22 caliber model that was purchased in February from a Wisconsin dealer, the same one that 48-year-old George Sodini got his guns from for use in the Aug. 4 fitness club killings near Pittsburgh. Cho also purchased a 9 mm model at a Roanoke gun shop.