After killing Hoggart (I think so) in undead crisis there is a chance of finding his brother, who wants to lay him to rest because someone stitched Hoggart's head with another body and rised up. You have 3 options leave it, trying to kill Hoggart or asking witch hunter what he's got to say about situation. If you picked witch hunter then this encounter will end and you can get unique weapon or armor.

PS: My first page on wiki, I apologise for any misspellings and if someone already wrote that I didn't know.