Brett Gardner announced his son Miller, 14, died March 21 from what authorities later determined was carbon monoxide poisoning. Look back at the teen's life and the shocking tragedy.

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.

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