OK, the story says that Dennehy and Dotson were being threatened by "Harvey." Dennehy allegedly had Dotson's back. They were sort of on the same side, if you will. However, the story says that Dotson shot Dennehy.
If they were down together, fighting against "Harvey" and someone else, why would Dotson turn on Dennehy? If he really did it like it says, why doesn't he just tell where the young man's body is? If you're going to kill me, at least let my family know where I am....