Has anyone else noticed the same exact town/city guard AI from Oblivion? All this talk of how "improved" the AI system is, yet in many instances it feels exactly the same. If you choose to kill anyone not within the confines of a structure, the guards automatically know you did by default (regardless if you were seen or not). This really kills the role play ideals of an assassin/thief like myself.
They are still having bugs with crime reporting chickens and the like, so it may not be the guard AI, but a bugged reporting system that sends them running.
However, I have killed someone in their house, in their sleep with a half dozen NPCs in the next room and not gotten a bounty or been reported. I used poison on them (with the perk) if you're curious. So it is possible to murder anonymously as the game stands right now.