So I have been working on a mod that involves two characters and a tavern. I have it set where the two characters hate each other through a relationship setting. One character is outside the bar, while the other is inside. While testing this mod I pulled the one from outside into the tavern, and a fight started (as it should have). Later, after killing the character from outside, a courier ran up to me with a letter. This letter was from the guy I placed in the bar. It stated how grateful he was for me helping him kill the other character, and that I should come back and see him to claim a gift a gratuity. This note had both their names on it. The only problem is that I did not create this letter, nor have I ever written any type of letter for this mod.
Yesterday when I killed this same character outside the tavern the same courier came up to me with a similar letter. Only that one was signed by someone in Solitude that I have yet to find. In that letter it went on to say they knew I killed ’such and such” and that they wanted to meet me.
Is there anyway to stop these letters from generating? It’s going to cause some serious confusion once the quest is written for this mod.

It is a quest - WIKill04, started by the "Kill Actor Event". To prevent this quest from starting, after one of your NPC's was killed, you could add both of them to the "WINeverFillAliasesFaction".

I'll give that a try. Thanks for the help.