Yeah, he did it.
I am of course referring to aerialist Nik Wallenda, great-grandson of Karl, who succeeded in crossing the Little Colorado River Gorge yesterday. He was up some 1,500 feet above the ground, and it took him about 22 minutes to complete the crossing. The gorge is near Grand Canyon National Park.
The National Park Service barred Wallenda from performing the stunt in the park itself.
You can view a clip of that walk here. There is a reason why Nik is a "born-again Christian": He needed all the help he could get walking that tightrope and in wind gusts as high as 35 mph.