as for u.s. attorney melinda haag, i've called and called and called and nothing. that's what i'm getting from my phone calls right now. good evening. i'm anderson cooper. in early june, southern california was the scene of a deadly shooting rampage. the suspect murdered five people, including his own father and brother before he was shot and killed. each time these crimes occur, we ask what could have been done to prevent it? were there any warning signs? often it's the people the closest to the perpetrators, their spouses, their relatives who feel the most responsible. tonight, an intimate perspective of the most troubled and violent among us from those who knew them best. we hear from wives, daughters, brothers and fathers of those who would commit unspeakable acts. randi kaye begins our special report "the mad man in my life."