It's another tragic loss for Luke Bryan and his wife, Caroline, as they mourn the loss of her niece. Sadie Brett was the infant daughter of Caroline's sister, Ellen Boyer. According to Boyer's Facebook posts, Sadie Brett was struggling with a number of medical issues, including heart problems. A post on Sunday night indicated that she had contracted an infection. On Monday, Boyer asked for prayers because Sadie Brett had "declined overnight." Bryan took to social media yesterday to thank fans for their prayers for Sadie Brett.