Miller Gardner -- the 14-year-old son of former New York Yankees outfielder Brett Gardner -- died from carbon monoxide poisoning, Costa Rican authorities have said.

Costa Rica authorities confirmed that carbon monoxide poisoning was the cause of death of Miller Gardner, the 14-year-old son of former New York Yankees outfielder Brett Gardner.

The Costa Rica resort where former Yankees star Brett Gardner and his family were vacationing has denied that there was carbon monoxide in the room his teenage son stayed in after local authorities suspected it led to his death.