During the autopsy, the medical examiner found maggots in the boy’s clothing and skin, and the maggots’ development was studied by a forensic entomologist to determine a timeline.

“The study of the maggots growth and development indicated that the child had not had a diaper change, bath, or been removed from the seat in over a week,” the deputy wrote in court records.

Authorities said this was inconsistent with the parent’s statements, and the Iowa State Medical Examiner’s Office ruled the death was a homicide with the cause of death being failure to provide critical care.

The investigation into the case involved the Iowa Division of Criminal Investigation, the state medical examiner’s office and the Chickasaw County medical examiner.

Deputies said they were assisted Wednesday in locating the couple by deputies in Mitchell and Fayette counties, as well as the Charles City Police Department. Where they were arrested was not disclosed.

Chief Deputy Reed Palo asked anyone with further information regarding the case to contact him at (641) 394-3121.

Koehn was arrested in September 2016 for allegedly bypassing the water meter to his mobile home in Riceville after utility workers turned off water service for nonpayment. A charge of second-degree theft was dropped in February after he agreed to pay the city of Riceville $1,600 in restitution plus court costs. In August, the Mitchell County Attorney’s Office asked the court to find him in contempt because he hadn’t been making payments on the agreement.

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