Erica Lafferty, daughter of Principal Dawn Hochsprung who was murdered in Newtown, reacts to the disturbing conspiracy theories promoted by an associate professor who says the shooting may not have happened.

"I think it's a disgrace to the community of educators worldwide that someone would belittle the entire situation belittle the 26 families, belittle the poor Sandy Hook staff members who had to live through that day. Honestly, it's disgusting to me," said Lafferty.

Read more about Dawn Hochsprung.