Temperatures were well below freezing with the wind chill overnight Friday. They were not found until Saturday when Haley's neighbor saw something odd outside his window.
Williams was discovered face down next to her vehicle at the home on 21 Opechee Drive in Barrington, and her sister Jean was found in the garage.
Police in Rhode Island believe it was a tragic accident that led to the death of two elderly twin sisters.
The sisters had returned to Haley's home from dinner Friday night with their 89-year-old sister.
The younger sister was not with her older siblings at the time. Nothing appears to have been taken from the women, who have not yet been identified. Investigators believe Haley was walking through the garage to go inside and call for help when she tripped on a rug and fell, police said. The twin sisters were found by a neighbor at approximately 8:11 a.m. on Saturday morning, still clinging to life. Authorities arrived at the scene and rushed both women to Rhode Island Hospital in nearby Providence. They died not long after they were admitted to the hospital.
Barrington Police Chief John M. LaCross offered his condolences to the victims' families Sunday.
On Friday night, much of New England recorded some of their winters coldest temperatures.
Barrington police said they do not suspect foul play was involved in the deaths of the 97-year-old twins Jean Haley and Martha Williams, the Providence Journal reported.