This episode is on the 1973 unsolved murder of 17 year old Ruth Anne Postif.
Sources:
https://www.newspapers.com/article/detroit-free-press-ruth-anne-postif/10075947/
https://www.newspapers.com/article/detroit-free-press/7223375/
https://www.newspapers.com/article/detroit-free-press-ruth-anne-postif/10075990/
https://www.newspapers.com/article/the-times-herald-ruth-anne-postif-funera/10075764
https://www.newspapers.com/article/detroit-free-press-ruth-postiff-murder-c/63645178/
https://www.newspapers.com/article/detroit-free-press-ruth-ann-postif-page/93409490/
https://www.newspapers.com/article/detroit-free-press-anders-1984-article-d/93410042/
https://www.newspapers.com/article/detroit-free-press-detroit-free-press-14/71051351/
https://www.newspapers.com/article/detroit-free-press-detroit-free-press-14/71051763/
https://www.newspapers.com/article/detroit-free-press-detroit-free-press-14/71052097/
https://www.newspapers.com/article/detroit-free-press-detroit-free-press-14/71053239/
https://www.newspapers.com/article/detroit-free-press-detroit-free-press-14/71053415/
https://www.newspapers.com/article/detroit-free-press-detroit-free-press-14/71053679/
https://www.newspapers.com/article/detroit-free-press-detroit-free-press-14/71054406/