"You know," he began, "in the media, the person who does (these) things is seen as just evil. But I've thought for a long time: What about the people who knew them? What about the friends?"

He chews this over.

"They knew them as a person. And now, being in that situation, it is very strange," Diaz said. "I knew this kid and there was no sign ever that he could hurt another person."

Many people told Diaz not to talk to reporters, but he just wants to talk. He wants information he might never get.

"I want to know how this could happen. How ... a shy kid could do this."