Nearly two weeks after New York Yankees star Brett Gardner suddenly and tragically lost his teenage son, Miller, the teenager's mysterious cause of death has of

Carbon monoxide poisoning was the cause of death of the teenage son of former Yankee Brett Gardner, authorities in Costa Rica confirmed.

Brett Gardner's son Miller's cause of death has been confirmed by local authorities nearly two weeks after his death. Miller was in Costa Rica with family when he died on the morning of Friday, March 21.