There are many theories about the body that was discovered in a Wych Elm tree in Worcestershire, England. Who was the woman in the tree, and how did she die? Who wrote the graffiti saying: "WHO PUT BELLA IN THE WYCH ELM", and were they connected to the case?
This may just be a case that is never solved.
Sources:
1) https://en.wikipedia.org/wiki/Who_put_Bella_in_the_Wych_Elm%3F
2) https://www.thehistorypress.co.uk/articles/who-put-bella-in-the-wych-elm/
3) https://www.birminghammail.co.uk/news/midlands-news/revealed-after-75-years-face-14329271
4) https://medium.com/lessons-from-history/the-mysterious-murder-of-bella-the-wych-elm-lady-bfb8c135272
5) https://crimereads.com/who-put-bella-in-the-wych-elm/