Alex Witt on MSNBC at 4:23pm:

"NBC News has become to some degree a part of this investigation...

NBC News has received some information from the deceased shooter...

In which we received a package that included some images a lengthy diatribe. We believe it may shed some light on what he was doing between the first shooting and the second...

It includes some images, disturbing, rambling, multi-page statement...

NBC News immediately turned this information over to authorities to assist in their investigation...

We are not going to give out any specifics of the information..."