Mar 27, 2025; Bronx, New York, USA; New York Yankees players stand for a moment of silence to honor the memory of Miller Gardner son of Yankees former player Brett Gardner. Brad Penner-Imagn Images
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 officially been released.
According to multiple news reports, a toxicology report revealed that Gardner's 14-year-old son passed away from carbon monoxide poisoning, Costa Rican authorities have confirmed.
Through a blood test, the toxicology report found a saturation level of 64% in Gardner's body. Concentrations higher than 50% are considered lethal.
Gardner died in his sleep on the morning of March 21 while on vacation with his family in Costa Rica. However, the source of his poisoning remains unclear and investigations are still ongoing.
The hotel where he died has not yet commented on the toxicology report, but the Gardner family reported feeling sick after dining out at a restaurant close to their hotel the night before.
Brett and his wife, Jessica, announced Miller's death in an official statement on March 23.
