The twins had returned to Haley's home from dinner Friday night with their 89-year-old sister. Police believe that Jean may have seen her sister fall and then tripped up on a garage rug while trying to get help.
Haley was left immobile, with the garage door wide open to the harsh weather outside, and her sister still stranded on the driveway.
Police believe the women died of hypothermia. They were rushed to Rhode Island Hospital in Providence in critical condition, but died a short time later.
Temperatures fell into the single-digits overnight Saturday due to Arctic air filtering south from Canada. They were quickly pronounced dead.
The cause of death has not been released, but cold temperatures are likely to have been a factor.
As police continue to investigate the weekend deaths of twin sisters in town, the police chief said it does not appear foul play was involved in the case. A man who identified himself as a grandson answered the phone at Haley's home Sunday and said the family would be commenting later. John W. "Jack" Haley, Jr., who lived at the home on Opechee Drive, died in 1995 leaving behind a wife, Jean, and three children.