Luke Bryan is opening up about sister Kelly Bryan's sudden death in 2007. "I've never really explained what happened to my sister," Luke, 49, said during the Tuesday, October 28, episode of CNN podcast's All There Is with Anderson Cooper. "There's some misinformation out there on the internet, and I think some people kind of wonder what happened and think that we've tried to cover it up." The musician revealed her cause of death for the first time. "But there is a very, very small percentage of people that die for no reason in the world," he said.