Mary J. Guerriero, 87, was found unconscious by family members around 7 a.m. on Tuesday as she and her husband were staying with their son after losing power at their own home.
According to published reports, Guerriero's husband and son were treated for carbon monoxide poisoning but later released.
The Thompsonville Fire Chief told the Hartford Courant that a generator located outside the house was likely the cause of the carbon monoxide as the deadly gas is suspected of seeping into the home as the family slept Monday night.
Authorities in East Hartford, Conn. are also investigating what appears to be a carbon monoxide-related death after a 35-year-old woman was found dead in her apartment Wednesday afternoon.
Police said she was cooking with charcoal in her kitchen.
Connecticut Gov. Dannel P. Malloy said Wednesday that there have been 187 people treated for carbon monoxide poisoning since the storm knocked out power to most of the state.
The Centers for Disease Control and Prevention lists the symptoms of carbon monoxide poisoning as headaches, dizziness, weakness, nausea, vomiting, chest pain and confusion.
"High levels of CO inhalation can cause loss of consciousness and death," the CDC reported on its website. "Unless suspected, CO poisoning can be difficult to diagnose because the symptoms mimic other illnesses. People who are sleeping or intoxicated can die from CO poisoning before ever experiencing symptoms."