The harp mailing list seems to have closed ranks. They didn't like this question at all, it seems. They are a sensitive lot who love their harps very much and the thought of serial killers doing anything harp related, let alone anything as *yukky* as this was probably too much for them to cope with. I can relate to that too because harp music is so beautiful and serial killing with bizarre/gory results is so sad that the two don't really go together at all.
Oh well, it was worth a try. It might create some responses after they have recovered from the state of shock they are in now.