XBox One:
I have a similar problem. I am a murderer in Talmberg!
The only explanation I can come up with is that I may have accidentally killed a guard while intervening in a holdup. I was on my way to kill the Cuman bandits in the forested area Southeast of Talmberg, when I ran into the holdup. After killing several bandits, I looted them, and also found a dead guard, which I did not loot.
This holdup took place at a fork in the road, and that’s when I noticed two Cumans coming towards me.
I had quite a struggle beating them. 6 against me.
After I killed what I thought was the last bandit, another came from behind and attacked me. I killed this one too, but it wasn’t a bandit, it was a guard. I didn’t realize he was a guard until I went to loot him, and thought “Why did he attack me? Surely he saw me kill the Cumans?” I questioned the authenticity of this NPC, because he had enough weapons on him for six men including shields. I took a lot of his weapons, but left everything else.
I thought I had completed the “Kill the Bandit Leader”, because one of the bandits I looted had a Captain’s face shield, but when I checked my map, I was still a little North of the area indicated for the quest.
So, I dumped or sold everything in Rattay from my kills, and went back the next day to clear the other bandit camp. When I went to report to Sir Divish he asked, “What do you want?” In an unfriendly tone. When I asked for training he scoffed. When I left the castle I was attacked by guards. I was accused of murder with no way to defend myself and had to spend ten days in jail.
It irks me that the game has no way around this.
It seems you should get atrial and be able to defend your actions as an accidental killing.