Passing your neighbor walking his dog down your colorful tree lined neighborhood sidewalk you greet each other with an easy hello, a trusting hello, after all, you've been annexed together for almost 15 years. Many exchanges have past between then and now, many cups of sugar borrowed. You feel that you know him, he's a part of your community, he even picks up your mail when you go out of town. But do you really know who he is?

Eric Harris, one of the boys responsible for the Columbine Massacre, according to neighbors was "A very nice polite clean cut kid". - 12 children and a teacher were killed 23 others wounded.

Buford O'Neal Furrrow was described by neighbors as "A very pleasant individual". - He killed a postal worker and wounded 5 people at a Jewish community center. Furrow was a member of the Aryan Nation and a wife beater.

Jeffrey Dahmer was characterized by neighbors as "Shy, a little withdrawn, but not really bizarre - he was the average Joe". - Dahmer murdered 17 men and boys. His murders involved rape, necrophilia and cannibalism.

Were there signs beforehand? Could these murders have been prevented?

Eric's life was dense with warnings of things to come, from his behaviors, the web sites he viewed to the journals he kept.

Furrows was reported a month or so before the shootings to have said to his psychiatrist "Sometimes I feel like I could just lose it and kill people" . His track record is packed to the gunwales with extreme acts of violence.

By age ten, Dahmer was experimenting with dead animals, decapitating rodents, bleaching chicken bones with acid, nailing a dog's carcass to a tree and mounting its head on a stick.

Who is your child? Do you know? Are you sure? If we take time to figure out who our children really are, what influences them and what they need, could these empty indiscriminate killings be avoided?

Do you really know what's going on behind your child's bedroom door?

Do you really know your neighbor?