I don't think any friend or acquaintance would help Terri to kill Kyron, no way. If she had harmed him, I don't think she'd go running to any of her friends or family to help dispose of a body either. Convincing someone to hide him is another story though, but have a feeling that's not what LE is looking at any longer. I'm not convinced that Dede was actually all that good of a friend to Terri. I think she was just a casual occasional friend of both Kaine and Terri, or that there could be more to it than is being told right now.