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

Carbon monoxide poisoning was the cause of death of the teenage son of former New York Yankees outfielder Brett Gardner, authorities in Costa Rica confirmed Wednesday night.

Miller Gardner, the teenage son of former New York Yankees outfielder Brett Gardner, died of carbon monoxide poisoning, ...

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

Brett Gardner's son, Miller Gardner, recently passed away on March 21, and we now know the unfortunate reason why.

Randall Zúñiga, director of the Judicial Investigation Agency, said they tested the 14-year-old Miller Gardner for ...

Costa Rican authorities believe Brett Gardner's 14-year-old son Miller died as a result of carbon monoxide poisoning. Randall Zúñiga, director of the Judicial Investigation Agency in Costa Rica, said ...

The baseball world continues to mourn with former Yankees star Brett Gardner and his family following the heartbreaking loss ...