UPDATE
3/24 5:49 PM PT -- Brett Gardner's 14-year-old son Miller died from asphyxiation at a resort in Costa Rica ... according to a new report.
Miller was staying at the property as part of a family vacation when he and others in the group fell seriously ill ... per Inside Edition.
Officials in Costa Rica are now reportedly working with the Gardners to return Miller's body to the United States.
Brett Gardner -- former star of the New York Yankees -- has just announced the death of his 14-year-old son .