On March 16, 2009, Rhonda Casto went on a hike in Oregon’s Columbia River Gorge with her boyfriend, Stephen Nichols, only to never return home. Before Casto headed out on her hike, she joked to a friend that Nichols was either “going to propose or kill me”. Somewhere along the trail, she slipped or fell 150 feet to her death. “48 Hours" Correspondent Peter Van Sant reports.

This classic "48 Hours" episode last aired on 9/08/2018. Watch all-new episodes of “48 Hours” on Saturdays and stream on demand on Paramount+.

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