A Cold Case Solved, Then Unsolved
Seven-year-old Maria Ridulph of Sycamore, Illinois, was offered a piggyback ride by a man she didn't know, and wasn't seen again until her body was found the next year, 100 miles away. The only witness was another child...
https://www.neatorama.com/2020/07/18/A-Cold-Case-Solved-Then-Unsolved/