You guys must be waaaay ahead of me. Still trying to solve the murder and I'm at a stopping point. Just discovered the grave has a sheep body and the Mortician wouldn't talk. Don't know where to go from there.
Enter the room on the first floor and read his diary.
Of course, after that, I kinda got stumped for leads. I ultimately ended up
shooting in a locked door
, which I think might have skipped a couple stages of the quest, not that I could tell.