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.

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 died last month of carbon monoxide inhalation, a toxicology report confirmed Wednesday night — just two days after Costa Rican authorities revealed the hotel room where the 14-year-old son of Yankees legend Brett Gardner stayed with his family had “high levels” of the noxious gas.