There are new details surrounding the tragic passing of Brett Gardner’s 14-year-old son, Miller Gardner.

The young son of the New York Yankees baseball superstar may have passed away due to carbon monoxide poisoning while vacationing with his family in Costa Rica.

Local authorities announced Monday (March 31) that investigators detected “high levels of carbon monoxide contamination” in the family’s hotel room at the Arenas Del Mar Beachfront & Rainforest Resort, via the New York Post.

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“It’s also important to note that next to [the family’s] room there is a specialized machine room, from which it is believed some form of contamination may have reached the guest rooms, potentially causing the incident,” Randall Zúñiga, general director of the Judicial Investigative Agency, said at the virtual press conference.

“The initial investigative findings indicate that the incident was due to this contamination, with levels as high as 600 parts per million detected — when the appropriate level in this case should be zero,” he added.

The investigation remains ongoing, and the toxicology results are still pending.

While it was originally speculated that Brett‘s son experienced an allergic reaction to food poisoning medication or from asphyxiation, those reasons were reportedly ruled out. Costa Rica’s Judicial Investigation Agency initially said that he likely passed away from suffocation after possibly ingesting a toxic substance.

He was found in his hotel room March 21 after he and several family members got sick on their vacation.

Dr. Kevin Gannon, who runs Manuel Antonio Urgent Care, said he had no vital signs and was “clinically dead” when medics arrived on the scene, via People.

His team then “perform[ed] advanced life support CPR” for 30 minutes but “there was not much [they] could do for him.”

The New York Yankees honored Brett Gardner‘s late son Miller during the opening day game.