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!