The 14-year-old had 64% saturation of carboxyhemoglobin in his blood. The deadly level is 50%, officials said.

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

Following on from the death of Miller Gardner, the 14-year-old son of New York Yankees legend Brett, authorities in Costa ...

Miller Gardner, the 14-year-old son of former New York Yankees player Aaron Gardner, died of carbon monoxide poisoning, Costa ...

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

Asphyxiation was initially thought to have caused the 14-year-old's death, but after an autopsy that theory was ruled out.

The death of the teenage son of former Yankees player Brett Gardner was caused by carbon monoxide poisoning, officials in ...

(NEXSTAR) – Carbon monoxide poisoning was the cause of death of the teenage son of former New York Yankees outfielder Brett ...

Miller, 14, died on the morning of Friday, March 21, while on a family trip in Costa Rica, the Yankees previously announced ...

Miller Gardner -- the 14-year-old son of former New York Yankees outfielder Brett Gardner -- died from carbon monoxide ...

Authorities in Costa Rica have revealed the cause of death for the 14-year-old son of former New York Yankees star Brett ...

Miller Gardner—the late 14-year-old son of former New York Yankees outfielder Brett Gardner—died of carbon monoxide poisoning ...