A sealed door at the end of a narrow hall is where police believe the gruesome plot was hatched. It is 2121 Harper Hall, and an orange, fish-shaped name plate outside the door notes it was the campus home of Cho Seung-Hui.
CNN visited the suite Thursday afternoon, including a common area Cho shared with his five other suitemates. Its cinder block walls have those suitemates convinced at least part of his angry videotaped statement about the massacre was recorded in their dormitory area, while they were likely off at classes.
"The backdrop of the video looks exactly like our suite's white bricks," Karan Grewal told CNN in an interview outside Harper Hall.
Grewal said Cho could not have recorded the manifesto with anyone around because it is such a small space, but he said his loner suitemate often sat quietly while the others came and left.
"Maybe he just figured out our schedules," he said.
Grewal says he and the others were handcuffed and questioned when police served a search warrant Monday night hours after the shootings. He says they all gave up months ago even trying to make small talk with Cho, and that Cho would look down when walking around the suite or in the hallways to avoid eye contact with others.
"He never spoke," Grewal said. "I never saw him with anybody else. Ever. I just thought he was very lonely."
Grewal says police asked him if Cho had any disturbing posters or clothing, and that he said he did not believe so. The search warrant inventory indicates computers, notes, a digital camera and CDs were among the items seized as police search for clues as to whether Cho knew or contacted any of his victims, or any more information as to why he carried out the massacre.
-- By John King, CNN Chief National Correspondent