In July of 2006, a 27-year-old woman and her mother set out for a four-mile hike around an idyllic Washington lake. Hours after they started their trek, their bodies were found by fellow hikers, and it was clear that they had been murdered. But how did they meet this tragic fate, and why? These are the stories of Mary Cooper and her daughter, Susanna Stodden, also known as the Pinnacle Lake Murders.

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CASE SOURCES

1. King 5: https://www.king5.com/article/news/crime/mary-cooper-susanna-stodden-unsolved-snohomish-county-murder/281-cf04d027-bb9e-4332-8572-f528fdff87b3

2. King 5: https://www.king5.com/article/news/local/david-stodden-passes-3rd-polygraph-test-in-unsolved-murders-of-wife-and-daughter/281-603049836

3. The Olympian: https://www.newspapers.com/image/806023375/?terms=mary%20cooper%20susanna%20stodden&match=1

4. Mary's Find A Grave: https://www.findagrave.com/memorial/14935751/mary-cooper

5. Susanna's Find A Grave: https://www.findagrave.com/memorial/169360955/susanna-stodden

6. Obituary: https://www.legacy.com/us/obituaries/seattletimes/name/mary-stodden-obituary?id=29016901

7. The Spokesman-Review: https://www.spokesman.com/stories/2007/mar/11/womens-deaths-remain-a-mystery/

8. University of Washington Magazine: https://magazine.washington.edu/mary-cooper-1950-2006/

9. Medium: https://medium.com/@jennbaxter_69070/the-bizarre-double-murder-of-mary-cooper-and-susanna-stodden-29cf63206e59

10. Herald Net: https://www.heraldnet.com/news/murder-case-is-cold-but-memory-still-burns/

11. US News: https://www.usnews.com/education/k12/washington/decatur-elementary-school-241334

12. Herald Net: https://www.heraldnet.com/news/three-years-and-no-answers-in-slaying-of-hikers/

13. Seattle Times: https://www.seattletimes.com/seattle-news/law-justice/10-years-after-his-wife-daughter-were-killed-on-hike-lack-of-answers-haunts-north-seattle-man/

14. Washington Trails Association: https://www.wta.org/go-hiking/hikes/pinnacle-lake

15. University of Washington Magazine: https://magazine.washington.edu/feature/murder-fascinates-but-experts-say-its-becoming-rarer/

16. Herald Net: https://www.heraldnet.com/news/shock-gives-way-to-grief/

17. Herald Net: https://www.heraldnet.com/news/murder-case-is-cold-but-memory-still-burns/

18. Washington Trail Association: https://www.wta.org/news/magazine/magazine/1207.pdf