Photographing the rooms of kids killed in school shootings

The families of nine school shooting victims opened their doors to Steve Hartman and photographer Lou Bopp, allowing them to document their children's bedrooms, just as they left them.

Each room waits for a child who will not return.

Their parents hope that these images will stick with you, that you'll carry a piece of their collective pain and use your heartache to help bring about change.

I never wanted to be this kind of reporter, knocking on the door of someone who lost a child in a school shooting. And yet here I stand, knocking, nonetheless.