Three American tourists found dead inside two villas at a luxury Sandals resort in the Bahamas earlier this month were killed by carbon monoxide poisoning, according to local news reports. Vincent Paul Chiarella, 64, of Florida, Michael Phillips, 68 and his wife Robbie Phillips, 65, from Tennessee, were found dead in the villas on May 6 at the adults-only Sandals Emerald Bay Resort on Great Exuma. Both the Tribune and The Nassau Guardian newspapers are reporting that their cause of death was carbon monoxide poisoning. The autopsy and toxicology reports are expected to be released soon, accordi…