I've tried to post this a few times, but when I hit "post" after typing it all out, I am logged out
So, I'll make this one quick.
What if....this little girl lived with her mother or grandmother in another state and that particular person passed away, so the little girl was given to her next of kin? Possibly her biological father, an uncle, older brother, etc.
I think the person granted custody (the "perp") lived in St. Louis and specifically in that neighborhood. I do think whoever did this was very familiar with the area.
Let's say the perp went to whatever state the little girl lived in and took custody of her and brought her back to St. Louis. Soon afterward, he sexually assaulted her, then panicked because he was afraid she would say something, so he killed her. Then, panicked again, because he knew she could be traced back to him, so he decapitated her. **Notice she was lying face down in the crime scene photos, so I think it's entirely possible to have cut her head off the way it was if she were laying face down when it was done. Especially with a larger man standing over her and bending down....or from behind. She was well nourished and had fingernail polish on, so maybe she had only been with him a day or two?
This is the only theory I can come up with where no one has ever missed her or looked for her. Her former classmates, friends, neighbors, etc. would probably just assume she was well and good with her next of kin in St. Louis.
How big an undertaking would it be to search (and how would you search) deaths in 1983 where next of kin took custody of an 8-11 year old girl. (however, I think it's possible she is a little bit older).
Thoughts?