People have been driving off of the canyon for decades. I don't know of any that were accidental. One Ranger who worked here before I did told me that on several occasions, when cars drove off and folks died, they went down and collected the remains. But there were no helicopters strong enough and affordable enough to haul the cars out. He told me Rangers went down later and sprayed the cars with paint to help them blend in with the rocks.
Nancy Eileen Muleady-Mecham, Park Ranger Sequel: More True Stories From a Ranger's Career in America's National Parks
grand-canyon, suicide