The official cause of death for Miller Gardner has been revealed following a two-week investigation. Miller, the 14-year-old son of former New York Yankees player Brett Gardner, died in his sleep on March 21 while on vacation with his family in Costa Rica.

Authorities in Costa Rica investigating the death of former New York Yankees outfielder Brett Gardner’s teenage son have concluded that he died of carbon monoxide poisoning. Miller Gardner, 14, was found dead on March 21 in his hotel room at the Arenas Del Mar resort in Manuel Antonio,

Carbon monoxide poisoning is reportedly what caused the death of Miller Gardner, the teenage son of retired New York Yankees outfielder Brett Gardner.