The Costa Rican hotel where Brett Gardner's family vacationed is taking precaution amid the investigation into Miller's death ... with officials telling TMZ Sports it has blocked off their room from the public as officials look into whether carbon monoxide played a factor in the tragedy.
Judicial Investigation Agency (OIJ) director Rándall Zúñiga revealed in a press conference that high levels of carbon monoxide were detected in the Arenas Del Mar Beachfront & Rainforest resort room the Gardners reserved during their trip .