I'm rather stumped on this. I expected more from the mortician, or rather, a chance to talk to her.

I don't think the mortician would murder in such a way if she is selling organs. again, there are simpler ways to kill someone. Right now I figure she's selling to the butcher.
Seeing as the body that washed up on the beach is already buried (and probably missing some organs) and the fact we can't even go to the cemetery makes me think that path is closed.
I'm voting for Shrine of the Suffering, seems like a good front for something

Currently, Silver Crescent Beach is leading with 44%. This is surprising because that is the most unremarkable death of the three. A body washed up that doesn't even indicate murder, someone could have lost their footing and drowned. But also because the body isn't even there anymore, and if it isn't even the location of the murder, just where the body was found, it may hold few clues.