CNN Senior Investigative Correspondent Drew Griffin reports on video messages sent by an 18-year-old from Yuvaldi, Texas, to a 15-year-old teenage girl in Germany.
He told her that he was going to kill his grandmother and go to elementary school right following that to shoot there.
The girl said that this was her only contact with this young man she was following on social media, and she got to know him through the chat room.
