Note: episode content begins just after the 10min mark (if you don't like football talk)

16 year old Sarah Yarborough was assaulted and murdered on the grounds of Federal Way High School in December of 1991.  Despite hundreds of leads and ample personnel assigned to her case, Sarah's case was not solved until just this last year, thanks to genetic genealogy.  

Sources

https://www.cbsnews.com/news/sarah-yarborough-murder-patrick-leon-nicholas-washington-state-in-prison-for-attacking-another-woman-released-early/
CBS’ 48 Hours - Season 36 Episode 12 - The Hunt for Sarah Yarbrough’s Killer
https://www.kiro7.com/news/local/nichols-found-guilty-1991-cold-case-murder-federal-way-teen-sarah-yarborough/5YNFOWKTOJHDBEBMJKJHY6NBME/
https://identifinders.com/first-genetic-genealogy-leads-cold-case/
https://newsfeed.time.com/2012/01/11/dna-evidence-links-murder-case-with-mayflower-era-family/
https://www.dailymail.co.uk/news/article-2084692/Sarah-Yarborough-murder-Could-DNA-linked-17th-century-Mayflower-family-solve-1991-case.html
https://archive.seattletimes.com/archive/?date=19921204&slug=1528262
https://www.seattletimes.com/seattle-news/law-justice/i-feel-that-tip-is-out-there-drawing-created-from-dna-breathes-hope-into-unsolved-federal-way-killing/
https://archive.seattletimes.com/archive/?date=19940224&slug=1896993
https://www.king5.com/article/news/local/king-county-announces-cold-case-arrest/281-7935be7f-03b3-4af4-9dc3-2f0ecdeefc92
https://www.fox13seattle.com/news/they-had-never-given-up-arrest-made-in-cold-case-murder-of-federal-way-teen
https://www.seattletimes.com/seattle-news/awkward-twist-over-dna-link-in-teens-slaying/
https://www.federalwaymirror.com/news/former-classmates-teachers-remember-murdered-federal-way-teen/
https://www.federalwaymirror.com/news/covington-man-pleads-not-guilty-in-1991-murder-of-federal-way-girl/
https://www.findagrave.com/memorial/24483104/sarah-louise-yarborough