Columbus police have opened investigations into the May deaths of two toddlers who died of drug overdoses in separate incidents. The Franklin County Coroner says 11-month-old Dominic Dickinson and 14-month-old Annabella Sagstetter both died from heroin mixed with fentanyl. Officers responded to a call reporting Dickinson was not breathing. Sagsetter was a passenger in a car when someone reported the girl was not breathing. The coronor says autopsies and toxicology tests could not determine whether the deaths are accidental or homicides.