Tests revealed that the room Miller Gardner, 14, the son of former New York Yankees outfielder Brett Gardner, stayed in while on vacation in Costa Rica had high levels of carbon monoxide, Rándall Zúñiga, the director of Costa Rica's Judicial Investigation Agency, OIJ, said in a statement posted to YouTube on Monday.

Carbon monoxide poisoning was the cause of death of the teenage son of former Yankees outfielder Brett Gardner, authorities in Costa Rica said.

The death of former New York Yankees outfielder Brett Gardner's son is now being investigated as a possible carbon-monoxide poisoning, investigators said Monday. Gardner's son, 14-year-old Miller, died in March during a family trip to Costa Rica.