Ambassador Stevens usefulness to both her[Hillary] and obama was rapidly coming to an end. And he knew where the bodies, some of them anyway, were buried. He was quickly going from an asset to a liability.She probably told the head honcho, he will be here and here on certain dates. He has to go because he knows too much. Make it look like an accident, or at least unplanned. You could safely bet your life that she is up to her eyeballs in Ambassador Stevens murder.
Absent smoking gun evidence, We have complete evidence of her total disregard for her responsibilities.
She decided for her own selfishness to totally trash decades of policy regarding sensitive and classified information and surrounded herself in a cocoon of silence by only allowing her select group of Yes people to communicate with her.
Ambassador Stevens died on her watch, but she went home when she knew an attack was in progress. She did not miss the 3am call, she took the phone off of the hook.