For the first time, Luke Bryan has revealed his sister Kelly Bryan's cause of death... and it's SO spooky! As you might recall, back in 2007, the country star's beloved sister died suddenly. She was just 39 at the time. She left behind her husband as well as two daughters, Jordan, 30, and Kris, 27, and a son, Tilde, 23. It was absolutely tragic - and incredibly shocking considering she'd been healthy.