A 4-month-old baby died of diaper rash and covered in maggots, claims assistant Attorney General Coleman McAllister of Mount Pleasant, Iowa,

The child's parents, Cheyanne Harris, 20, and Zachary Koehn, 28, are being charged with murder after their 4-month-old son, Sterling Daniel Koehn, was found dead last summer. The baby boy weighed less than 7 pounds and was wearing a diaper that hadn’t been changed in over a week.

Zach reportedly called police to report that his son had died, just a few hours after he said Cheyenne fed the boy.

When police arrived, they found the baby in a powered swing seat in a different bedroom from where the couple and their other child slept.

A forensic entomologist was able to determine the child “had not had a diaper change, bath, or been removed from the seat in over a week.”

McAllister said the feces in Sterling's diaper had attracted the maggots, and the baby's irritated skin ultimately ruptured, causing an E. coli infection to develop - which killed him.

Cheyanne and Zachary are currently on trial, facing charges of first-degree murder and child endangerment resulting in death.

Attorney General Coleman McAllister is currently prosecuting the trial. He told jurors in his opening statement, “He died of diaper rash. That's right, diaper rash," .