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.

A blood test for carbon monoxide showed a saturation level of 64% in Gardner’s body, Costa Rican officials said. Concentrations above 50% are considered lethal.

Miller Gardner, the teenage son of former New York Yankees outfielder Brett Gardner, died of carbon monoxide poisoning, authorities in Costa Rica said Wednesday night.

Miller Gardner, the 14-year-old son of former New York Yankees outfielder Brett Gardner, is believed to have died as a result of carbon monoxide poisoning.

The statement refutes a Monday announcement by Costa Rican authorities that there were “high levels of carbon monoxide contamination” in the room where 14-year-old Miller Gardner was found

The former New York Yankees outfielder's 14-year-old son died on March 21 during a family vacation in Costa Rica.

Una intoxicación por monóxido de carbono fue el motivo del fallecimiento del hijo adolescente del expelotero de las Grandes Ligas Brett Gardner, confirmaron el

The Costa Rica hotel where former Yankee Brett Gardner's son Miller died on March 21 has refuted a claim that the 14-year-old died of carbon monoxide poisoning in a statement issued to PEOPLE on Tuesday,