Apparently a sim was in the process of dying in my game, so I couldn't do anything but quit the game. But before I did I located the area where the death was taking place. https://scontent-dfw5-2....
I would suggest reset sim but then you've stated you're unsure of which sim it is. I imagine eventually the mourners will just carry on with their lives. Maybe find out all the mourners names and reset them instead?