The death of Miller Gardner, the 14-year-old son of former New York Yankees outfielder Brett Gardner, at a beach resort in Costa Rica is believed to be related to carbon monoxide inhalation, the Judicial Investigation Agency (OIJ) of the Central American country said Monday.

The Costa Rica hotel where Brett Gardner's 14-year-old son Miller Gardner died alleged officials made "an error," saying the level of carbon monoxide found in the family's room was "non-lethal."

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.