When carboxyhemoglobin saturation exceeds 50%, it is considered lethal. In Gardner’s case, the test showed a saturation of 64%.

The investigation into the death of New York Yankees baseball star Brett Gardner's 14-year old son is continuing.

Miller Gardner ‘s cause of death has been confirmed by Costa Rica authorities. The 14-year-old son of former New York Yankees star Brett Gardner died of exposure to poisonous gases including carbon monoxide poisoning, Us Weekly confirmed on Wednesday, April 2.

Miller Gardner, the youngest son of former New York Yankees outfielder Brett Gardner, died at the age of 14 while on vacation with his family.

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.

Brett Gardner's son Miller's cause of death has been confirmed by local authorities nearly two weeks after his death. Miller was in Costa Rica with family when he died on the morning of Friday, March 21.

The New York Yankees star’s 14-year-old son was found dead in his hotel room during the family’s vacation in Costa Rica.

After Brett Gardner’s son Miller Gardner was found dead during a vacation in Costa Rica, authorities confirmed that the 14-year-old died from exposure to poisonous gases including 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 Gardner. Gardner’s son Miller