A 69-year-old Arizona tourist recently fell off a ledge at the Grand Canyon, making her the fourth person to die there in the past month. So what's happening? Park rangers routinely warn tourists of the danger and signs are posted along the edge, but authorities say many are ignoring the risks to snap that perfect photo. “They are just not processing how dangerous it is. They're more focused on the photo op,” author and canyon expert Michael P. Ghiglieri told Inside Edition.