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

The teen died suddenly on March 21 while on vacation in Costa Rica after suffering a mysterious illness that affected several members of his family.

Initial reports indicated Miller likely died of asphyxiation in his sleep due to food poisoning, a theory that was ruled out.

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