Jonathan Kellerman began researching child violence for an Op-Ed piece in USA Today, and continued to study it when Ballantine approached him to write a book on the subject.
"How could my son be a Nazi?" Susan Yassenoff Klebold, Dylan's mother, said at the funeral, according to Marxhausen. "He's half Jewish, and the seder is practiced in our home. He was still complaining about having to say the Four Questions."