Looks like the murderer did not always achieve the desired result if he had to discard some of his "creations".
I already thought that it had something to do with a wicked person who pretended to be a medical physician. Now it is all clear.
Good read!
This story reminds me of these a bit:
https://imgur.com/gallery/G7XuS
http://i.imgur.com/QBEexyc.jpg
https://www.bbc.com/news/world-europe-15653074
Puppets and dolls for everyone!