There's a book about ALL the deaths in the Grand Canyon (although they'll need to update for 2026) and honestly it's fascinating and a VERY easy read. I recommend it.
One little kid starts with his family on the rim and is running around excited as little boys do the entire time. They get to the river bottom and he simply drops dead of dehydration. A Boy Scout troop gets into a similar situation, for which I think the troop leaders should be banished from society.