What's an unusual item to stab someone to death with? It has to be found in a house in the 1880s though.
Chop it up and feed it to the farm animals.
Won't it be found if a character just chucked it in a river, and I already did the tie a rock to the body and let it sink and decay thing.
*is trying to figure out what kind of farm animals you have that are carnivorous*
*is trying to figure out what kind of farm animals you have that are carnivorous*