The 14-year-old son of former New York Yankees outfielder Brett Gardner died from carbon monoxide poisoning while visiting Costa Rica, local authorities have confirmed .

Miller Gardner, the teenage son of New York Yankees alum Brett Gardner, died from carbon monoxide poisoning, Costa Rica officials confirmed. A new toxicology report found the 14-year-old South Carolina boy's body had carboxyhemoglobin level of 64%,

A forensic pathologist explained to Us Weekly why the late Miller Gardner may have experienced a stronger reaction to carbon monoxide than his family

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.

After initially having disregarded it as a potential cause of death, Costa Rican officials said the teen son of former New York Yankees outfielder Brett Gardner may have died during family vacation as a result of carbon monoxide poisoning.

The death of former New York Yankees outfielder Brett Gardner's son is now being investigated as a possible carbon-monoxide poisoning, investigators said Monday. Gardner's 14-year-old son, Miller, died in March during a family trip to Costa Rica. The Gardner family announced his death in a statement released by the Yankees two days later.

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.