When a woman is found in tarp off the side of the highway in 1968, she remains unidentified for over 30 years. This was a case that took decades to get to the bottom of - and even now, there are still so many questions remaining.
Sources:
1) https://www.newspapers.com/article/the-tennessean-barbara-ann-hackman-taylo/24013583/
2) https://news.google.com/newspapers?nid=1696&dat=19980423&id=9PEaAAAAIBAJ&pg=6796,2875583
3) https://en.wikipedia.org/wiki/Barbara_Ann_Hackmann_Taylor
4) https://www.cbsnews.com/news/the-story-of-tent-girl/
5) https://www.huffpost.com/entry/a-body-in-kentucky-the-30_b_11389174