Can someone spoil me who the one behind shuli's death ? （￣へ￣）

I think I read in the commands, that it's the vice-commander of her guards. You know, the brown haired dude who visited his church friend. I think it was something with, that he was absolutely loyal to the late wife who died and when the rumour came out, that our mc had an affair, he couldn't take the fact, that she ruined the houses reputation.