Miller Gardner, the 14-year-old son of former New York Yankees outfielder Brett Gardner, tragically passed away on March 21, 2025, while on vacation with his family in Costa Rica. Authorities now believe the cause may have been carbon monoxide poisoning, according to the Judicial Investigation Agency (OIJ) of Costa Rica.
What Happened to Miller Gardner?
Miller died in his sleep at a hotel while vacationing with his family at the Arenas Del Mar Beachfront & Rainforest Resort in Manuel Antonio, located along Costa Rica’s Pacific coast.
According to a family statement, several family members also became ill during the trip, though no further details were shared about their symptoms.
Elevated Carbon Monoxide Levels Found
On April 1, OIJ Director Rándall Zúñiga confirmed that tests on the family’s hotel room showed high levels of carbon monoxide, a colorless and odorless gas that can be deadly.
Zúñiga said the room was next to a “specialized machine room,” which may have leaked carbon monoxide into the space where the Gardner family was staying. He added that the investigation is being done in coordination with the U.S. FBI, and the final toxicology results are still pending.
Hotel Statement: Still Awaiting Confirmation
The resort issued a statement expressing deep sorrow over the tragedy and confirmed it is fully cooperating with Costa Rican investigators.
“We are heartbroken by the tragic loss… We trust that the forensic process will clearly and conclusively clarify the causes of this unfortunate incident,” the statement said.
They also emphasized their commitment to guest safety, stating that they will not comment on any unconfirmed causes out of respect for the ongoing investigation and the family’s privacy.
What Is Carbon Monoxide Poisoning?
Carbon monoxide (CO) is a silent killer because it cannot be seen, smelled, or tasted. It is created when fossil fuels are burned, such as in:
- Cars and trucks
- Gas stoves and heaters
- Generators
- Boilers and furnaces
Symptoms of carbon monoxide poisoning include:
- Headaches
- Dizziness
- Nausea or vomiting
- Fatigue and confusion
- Difficulty breathing
In high concentrations, carbon monoxide can cause death within minutes. The CDC and health experts recommend carbon monoxide detectors in all enclosed living spaces to prevent such tragedies.
Previous Theory: Food Poisoning
Earlier in the investigation, Costa Rican authorities had considered food poisoning as a possible cause of death, but new test results have shifted the focus to carbon monoxide exposure.
OIJ officials say final autopsy and toxicology results may take two to three months to be completed and officially released.