Brett—who also shares son Hunter, 16, with Jessica—and his wife shared on March 23 that Miller “died peacefully in his sleep” and that they “have so many questions and so few answers at this point.” “With heavy hearts we are saddened to announce the passing of our youngest son, Miller,” the Gardner family said in a statement shared to the Yankees’ X (formerly Twitter) account. “He was 14 years old and has left us far too soon after falling ill along with several other family members while on vacation.” They continued, “Miller was a beloved son and brother and we cannot yet comprehend our life without his infectious smile. He loved football, baseball, golf, hunting, fishing, his family and his friends. He lived life to the fullest every single day.” Read on for everything to know about the life and death of Miller Gardner. (E! and NBC News are both part of the NBCUniversal family.)