The Cambria County coroner's office said autopsy and toxicology reports confirmed that Summer Chambers died of dehydration and starvation in the home in Kernville, about 60 miles east of Pittsburgh, a few days before Christmas.
Coroner Jeff Lees called the case "heart-wrenching" and ruled the infant's death homicide due to parental neglect.
Lees says toxicology tests indicate that 27-year-old Jaron Chambers and 19-year-old Chelsea Cordaro died of acute fentanyl overdoses. Lees says the woman had four times the lethal range of the drug and the man had 2 times the lethal range.
Lees says the parents died on or about Dec. 15 and the child probably on Dec. 19 or Dec. 20. The bodies were found Dec. 22.