Cho did not appear to have any friends or a girlfriend, said Joseph Aust, one of his five roommates. He wore a standard uniform - blue jeans, T-shirt and maroon Virginia Tech hat, and kept only textbooks and a laptop computer. His one known passion was downloading music.

He hung no pictures, posters or decorations on his walls, and he avoided conversations with his roommates and other students.

"He would just give one-word answers," Aust said.

Heh, that's exactly how I'm like. So I'm a potential killer, huh? :(