A high level of carbon monoxide was detected in 14-year-old Miller Gardner's hotel room, Costa Rican Police revealed.

The death of former New York Yankees outfielder Brett Gardner's son is now being investigated as a possible carbon-monoxide poisoning, investigators said Monday. Gardner's 14-year-old son, Miller, died in March during a family trip to Costa Rica. The Gardner family announced his death in a statement released by the Yankees two days later.

The Costa Rica hotel where Brett Gardner's 14-year-old son Miller Gardner died alleged officials made "an error," saying the level of carbon monoxide found in the family's room was "non-lethal."