Not sure what I did, but I stopped by Riverwood to unload some loot, and as I walked out of the traders store, I was attacked by a guard. Then some women started after me as well. Was just the two of them, as I think the repeated dragon attacks on Riverwood have killed the rest of the guards. Either I accidentally shot someone during the last dragon attack, or they figured out that I lured the elf away and sacrificed him to Boethia. But I doubt they know that! I'm guessing it was the last dragon, as poor little Riverwood gets hit by a dragon just about every time I travel there.
Is there any way to appease the apparent lone guard? Or do I have to kill him to get any peace?