Costa Rican authorities are investigating whether former Yankee star Brett Gardner’s teen son died from an allergic reaction to medication he was given after asphyxiation was ruled out.

Miller Gardner, 14, was found dead in his bed Friday morning after he and members of his family fell ill after eating at a restaurant near the exclusive resort where they were vacationing.

Days later, his sudden death remains a mystery.

Investigators are now probing whether or not the teen was allergic to any medicine he may have been given when the family was treated by a doctor, sources told ABC News.

Miller Gardner died while on vacation with his family in Costa Rica on March 21, 2025.

The Gardner family at a Georgia Bulldogs game posted to Instagram on Oct. 5, 2024. Instagram / Hunter Gardner

“The hotel staff dispatched a medical team immediately, including a licensed doctor, which arrived to handle the emergency situation,” the $2,000 per night Arenas Del Mar Resort in Manuel Antonio said in a statement to ABC News.

The resort added that protocol “does not allow for hotel staff to provide any medications to guest.”

The Arenas Del Mar Beachfront and Rainforest Resort in Costa Rica. Arenas Del Mar Beachfront & Rainforest Resort

An autopsy has not yet been completed and authorities warned Tuesday that it could take months before they determine how Gardner died.

Costa Rican officials said Tuesday an examination of the teen’s body found that his airways were not obstructed after investigators initially believed the teen choked to death because he had vomited in his bed.