Unsolved Mysteries: 3 Chilling National Park Cases, One Ending in Homicide

I go over three chilling cases in National parks. My condolences go out to the families of the victims and I hope that they find out what happened to their loved ones.

URL:
Links with the missing persons:
https://www.nps.gov/orgs/1563/cold-cases.htm

https://abcnews.go.com/US/hiker-missing-grand-canyon-told-dad-needed-back/story?id=28812377

https://www.strangeoutdoors.com/mysterious-stories-blog/tag/Derek+Joseph+Lueking+-+Strange+Disappearances+from+U.S.+National+Parks