That was Dwain Weston, an Aussie and the best in the world. Below is a link to really good article he wrote mid last year.
He was as calculated as anyone, but yeah, he knew it would happen eventually. He hit a bridge in Colorado, he jumped with a mate, the mate went under the bridge and Dwain was meant to go over it (they had superman suits on) but he got closer than he should have (he changed direction) and his knees clipped the railing (there was a massive dent in the railing). Died on impact. If he was a couple of feet higher he would have made it over.
I want to get into BASE jumping but I've only sky dived once so a long way to go.