Miller Gardner's cause of death remains a mystery as Costa Rica investigates vacation tragedy. Here's what we know.

Miller Gardner, the youngest son of former New York Yankees outfielder Brett Gardner, died on March 21 at the age of 14 while on vacation with his family in Costa Rica. "Our hearts are heavy, and the Yankees family is filled with grief after learning of the passing of Miller Gardner. Words feel insignificant and insufficient in trying to describe such an unimaginable loss. It wasn't just Brett who literally grew up in this organization for more than 17 years -- so did his wife, Jessica, and their two boys, Hunter and Miller. 

The investigation into his death is ongoing and the cause remained a mystery. Here is what we know about Miller Gardner's death so far. We grieve with Brett, Jessica, Hunter, and their community of family and friends in mourning the loss of Miller, who had a spark in his eyes, an outgoing and feisty personality, and a warm and loving nature.

Our love for the Gardner family is unconditional and absolute, and we will offer our enduring support while understanding their desire for privacy at this time.