I remembered hearing somewhere that if you kill NPCs when they are implemented, you would suffer negative social buffs when socializing with others. But as I heard about this, something didn't make sense, how would these people know what you did if they didn't see you perpetrate the murders? Would they have a sort of telepathic sense that you personally were killing? This is where my idea would come in. At the moment, there is only one type of corpse, and whether the body was human or zombie seems to be indistinguishable. However, I would think a survivor could easily tell if the person was a zombie or not. So my proposition would be to make a different variant of a corpse, still called a corpse but with a different graphic and a special twist to it. This variant would carry information regarding things such as method of death. If the person who was killed was killed with an ax and left out, a passing NPC could see this person and tell by the wounds sustained he/she was killed by an ax, this NPC would then be extra wary and carry distrust toward any new strangers who carried axes in combat. This mechanic could also be used by the player to investigate any bodies and tell if there were murderers to look out for, these tags could also give random information upon inspection such as the person's name or occupation, maybe even a trait or two. The option to investigate could crop up like the info tag on plants and maybe if the player met NPCs, the information could be brought up to them in conversation to learn of any affiliation.