Two-Year-Old Accidentally shoots and kills pregnant mother with father's loaded handgun

The mother called 911 after being shot in the back by her 2-year-old son at their Ohio home
Doctors performed an emergency C-section but the unborn child did not survive and the mother died from her injuries
The gun belonged to the father and was usually kept loaded in a nightstand next to the bed
Police are investigating how the toddler accessed the gun and pulled the trigger
The case has been forwarded to prosecutors to consider criminal charges