Runil dead (not by me !!)

[MOka]

Runil is an Arkay priest who live at Falkreath.
I really don't know what happened. >_< I found him dead, in the cimetery, completly nude and nothing on him. I'm totaly not the one who killed him, the day before he talked to me, i'm going to the inn for sleeping, and .. he dead.

I checked the skyrim wikia, nothing on him about this.
Some of you already got that one? Found an NPC dead in one city, with no armor, completely looted by someone?
I'm pretty confused by all this.

[CERBERUS]

Vampire attack. Sometimes they kill people like a merchant you find lying dead. Kinda sucks.

[MOka]

Really?! o_o It's because of the dark brotherhood?

At least, Runil seem important for the quest in falkreath. So, i don't like use the console, but i think it's necessary in this case :(
Thank for the fast reply ! ^_^