I only saw excerpts of the Diane Sawyer interview with Susan Klebold. But I did find this essay she wrote for O magazine. I ust remember thinking back then of the double anguish they felt, of losing their son to suicide and that he was a violent murderer. Could it get worse than that?
http://www.oprah.com/world/Susan-Klebolds-O-Magazine-Essay-I-Will-Never-Know-Why