Keith Hunter Jesperson was a serial killer active from 1990-1995. His final victim was the only one he knew personally and she led to his capture and later incarceration.

Sources:

https://en.wikipedia.org/wiki/Keith_Hunter_Jesperson

https://criminalminds.fandom.com/wiki/Keith_Hunter_Jesperson

https://murderpedia.org/male.J/j/jesperson.htm

https://www.nbcbayarea.com/news/california/california-happy-face-killer-victim-idd-after-29-years/2867863/

https://www.biography.com/crime/keith-hunter-jesperson

https://people.com/crime/womans-plot-to-frame-boyfriend-for-murder-let-serial-killer-continue-spree-abc-20-20/

https://www.kptv.com/2022/04/19/missing-molalla-woman-identified-victim-happy-face-serial-killer/

https://www.nbcnews.com/news/us-news/oregon-mom-identified-victim-happy-face-killer-nearly-4-decades-death-rcna25112

https://patch.com/california/gilroy/gilroy-cold-case-murder-victim-identified-after-nearly-30-years

https://www.dailymail.co.uk/news/article-10730169/California-Happy-Face-Killer-victim-IDd-29-years.html

https://www.mercurynews.com/2023/10/04/a-seventh-victim-of-the-happy-face-killer-is-identified/

https://www.al.com/news/2023/10/florida-happy-face-killer-victim-identified-after-29-years-watch-chilling-prison-interview.html

https://www.oxygen.com/snapped/crime-news/who-is-happy-face-killer-keith-hunter-jesperson

https://dnadoeproject.org/case/blue-pacheco-jane_doe-1983/

https://www.forensicmag.com/585305-The-Fifth-Victim-of-the-Happy-Face-Killer-Finally-Gets-Her-Name-Back/

https://www.orovillemr.com/2009/09/17/serial-killers-sole-survivor-tells-story-after-19-years/

https://docpub.state.or.us/OOS/searchCriteria.jsf

https://crimelibrary.org/serial_killers/predators/jesperson/pleas_9.html

https://www.serialkillercalendar.com/Keith%20Hunter%20JESPERSON.php