After Brett Gardner’s son Miller Gardner was found dead due to carbon monoxide exposure during a vacation in Costa Rica, a CO forensics investigator explained why his family didn’t face the same fate.

A toxicology report after his death found high levels of carboxyhemoglobin, an indicator of carbon monoxide in the blood, according to a statement from Randall Zúñiga, the director of the Costa Rica Judicial Investigation Agency. Miller Gardner’s test showed a saturation of 64 percent, he said, adding that anything over 50 percent was lethal.

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.

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.

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

Miller Gardner—the late 14-year-old son of former New York Yankees outfielder Brett Gardner—died of carbon monoxide poisoning, Costa Rican authorities said Wednesday. The announcement comes 13 days after Miller's death during a family vacation,