On Valentine’s day 1975, 16 year old Dinah Peterson snuck out of her house to visit a boy her parents disapproved of. Tragically, Dinah never made it to her boyfriend’s house and the next morning Dinah’s father found her lying lifeless on the ground, having been murdered in their own back garden.

This episode discusses the original investigation and explores this case that stayed unsolved for over 30 years.

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Sources used in this episode:

Documentary: Killer in Plain Sight - Teenage Rage 

https://www.leagle.com/decision/inwaco20110912a43

https://www.seattletimes.com/seattle-news/killer-gets-minimum-of-16-years-for-1975-cold-case/#:~:text=James%20Groth%2C%2050%2C%20maintains%20he,long%20been%20considered%20a%20suspect.

https://www.seattletimes.com/seattle-news/man-charged-with-murder-of-teen-after-30-plus-years/

https://www.seattlepi.com/local/article/Prosecutor-asks-jury-to-correct-police-mistakes-1303887.php

https://www.bookscool.com/en/Fatal-Friends-Deadly-Neighbors-and-Other-True-Cases-556589/31

https://www.chiefsplanet.com/BB/archive/index.php/t-178053.html

https://www.seattletimes.com/seattle-news/man-50-guilty-in-1975-cold-case-murder/

https://www.findagrave.com/memorial/6648212/diana-marie-peterson

https://www.heraldnet.com/news/1975-murder-case-goes-to-trial-in-seattle/

https://www.seattletimes.com/subscribe/signup-offers/?pw=redirect&subsource=paywall&return=https://www.seattletimes.com/seattle-news/despite-guilty-verdict-slayer-says-he-didnt-kill-classmate-in-75/