This is, as the title suggests...when the player character dies, there is a configurable chance that they will be necro'd by the nearby NPCs.
I am not the original mod creator, and I cannot find who it was as it seems to have been deleted to give credit to. If anyone knows who, (or you are the author reading this) please do let me know and I will add credit.
In the original posts comment thread, another user made a scanning "variant" which made the mod not a run once event, and i
SLPGN 2.1.2 - Death Expression version
Added new requirements: MFG Fix (get the version 1.54 in the Old Files section for SE - 1.5.97, else this won't work). Also read: Steam guide
I may have added a couple of requirements, such as this and Papyrus extender before, but they are both essential mods for bug fix and enhancement without gameplay changes, so I still recommend getting them even when not using this version. From what I see, even SexLab is probably using MFG Fix