Miller Gardner, the teenage son of New York Yankees alum Brett Gardner, died from carbon monoxide poisoning, Costa Rica officials confirmed. A new toxicology report found the 14-year-old South Carolina boy's body had carboxyhemoglobin level of 64%,

Costa Rica authorities confirmed that carbon monoxide poisoning was the cause of death of Miller Gardner, the 14-year-old son of former New York Yankees outfielder Brett Gardner.

Miller Gardner -- the 14-year-old son of former New York Yankees outfielder Brett Gardner -- died from carbon monoxide poisoning, Costa Rican authorities have said.