Michael P. Ghiglieri, author of “Over the Edge: Death in the Grand Canyon,” said many of the accidental fall deaths can be attributed to a lack of understanding of the inherent danger of the rim.

: https://www.azcentral.com/story/news/local/arizona/2019/04/08/grand-canyon-deaths-recent-incidents-national-parks-history-fatal-falls-south-rim/3402029002/