5. Roger Dean

https://unsolvedmysteries.fandom.com/wiki/Roger_Dean
http://blogs.denverpost.com/coldcases/2010/12/05/family-of-murdered-businessman-extorted-years-later/1830/
https://coloradocommunitymedia.com/stories/cold-case-files-who-killed-roger-dean,75259
https://unsolved.com/gallery/roger-dean/
https://lonetreevoice.net/stories/murder-still-unsolved-after-25-years,82326
https://www.westword.com/news/ten-unsolved-colorado-murders-on-national-day-of-remembrance-read-victims-personal-stories-5837755

4. Baby Parker

https://www.northbaynipissing.com/news-story/5764072-police-still-hope-to-solve-baby-parker-mystery-10-years-later/
https://www.sachem.ca/news-story/5764072-police-still-hope-to-solve-baby-parker-mystery-10-years-later/
https://www.brantfordpolice.ca/baby-parker
https://kitchener.ctvnews.ca/who-was-baby-parker-case-still-unsolved-after-11-years-1.3162077
https://www.thespec.com/news-story/2140527-the-mystery-of-baby-parker/
https://unidentified.wikia.org/wiki/Baby_Parker

3. The Fort Worth Three

https://www.chron.com/news/houston-texas/texas/article/Texas-family-seeks-to-solve-42-year-long-mystery-10787947.php
https://www.star-telegram.com/news/local/fort-worth/article115763903.html
https://www.star-telegram.com/news/state/texas/article113894478.html
https://cw33.com/2014/12/24/40-years-later-vigil-for-missing-fort-worth-girls/
http://charleyproject.org/case/julie-ann-moseley
http://charleyproject.org/case/lisa-renee-wilson
http://charleyproject.org/case/mary-rachel-trlica
https://dfw.cbslocal.com/2014/12/23/3-fort-worth-families-remain-hopeful-about-40-year-cold-case/
http://www.missingtrio.com/TRIO/index.aspx

2. Nyleen Kay Marshall

https://missoulian.com/news/state-and-regional/nyleen-kay-marshall/article_95139a67-8704-51a7-9617-e4f55a56d33c.html
https://mtstandard.com/news/state-and-regional/nyleen-kay-marshall/article_344c3788-f7dd-5647-9c3f-33d7bb8abdf0.html
http://childfindofamerica.org/wp-content/uploads/2015/04/2105-Marshall_N.pdf
https://www.crimeonline.com/2017/01/06/nyleen-kay-marshall-4-disappears-on-family-outing/
https://billingsgazette.com/nyleen-kay-marshall/article_8c5f98f6-b908-5ec7-a31d-636466571ac5.html
http://www.doenetwork.org/cases/266dfmt.html
http://charleyproject.org/case/nyleen-kay-marshall
https://unsolvedmysteries.fandom.com/wiki/Nyleen_Marshall

1. The 3X Killer

https://books.google.ca/books?id=gijG7fSwvjAC&lpg=PA364&ots=KQ4EEWcLBy&dq=The%203X%20Killer&pg=PA364#v=onepage&q=The%203X%20Killer&f=false
https://www.nydailynews.com/archives/news/fish-eyes-3x-june-1930-chapter-67-article-1.867342
http://www.angelfire.com/journal2/farmville/eidisi/history/3X.html
http://www.historicalcrimedetective.com/mr-secret-agent-man-the-3x-killer-of-queens/
https://www.nytimes.com/1930/07/08/archives/mulrooney-is-sure-3x-killer-has-fled-announces-withdrawal-of-200.html