862.225.1965
On August 30, 2017, medics responded to an apartment in Alta Vista, Iowa, discovering one of the most horrifying child death cases in the state’s history. Four-month-old Sterling Koehn lay dead in a powered baby swing, his tiny body infested with maggots in various stages of development, having been left unchanged and unmoved for more than a week. The case, later featured on Court TV and analyzed by the Bianchi Law Group, presents a stark examination of parental responsibility and the criminal response to deliberate neglect.
The facts are indefensible. Sterling weighed just under seven pounds at death, hardly more than his birth weight four months earlier. He measured 14 inches long, placing him well below the fifth percentile in size and weight. His parents, 29-year-old Zachary Koehn and 21-year-old Cheyanne Harris, claimed they had fed and checked on him, yet forensic evidence contradicted this. As the Bianchi Law Group noted in their analysis, there is no way for a parent to explain the conditions in which Sterling was found. The maggots alone, insects that require days to weeks to develop, provided irrefutable proof of prolonged neglect.
The Prosecution’s Case: Diaper Rash and Extreme Indifference
Assistant Attorney General Coleman McAllister presented a memorable phrase capturing Sterling’s death. “He died of diaper rash,” McAllister told jurors. “That’s right, diaper rash.” He was not minimizing the death but rather distilling it to a brutal truth. A baby left in the same maggot-infested diaper for nine to fourteen days developed a rash so severe that his skin ruptured, allowing E. coli bacteria to enter his bloodstream. Sterling died because his parents failed to change his diaper for more than a week while he sat in a powered swing.
The evidence painted a picture of deliberate, extreme indifference to human life. The couple’s two-year-old daughter thrived in the same apartment, fed and cared for. This detail alone undermined claims that the parents lacked the ability to provide basic care. Zachary Koehn worked as a trucker, earning income sufficient to support his family. They lacked only the will to provide Sterling with basic care.
Medical examiners documented that flies had laid eggs on Sterling’s body while he lived, and those eggs hatched into maggots that crawled on his skin for days. Sterling experienced this nightmare while his parents remained in the apartment, caring for themselves and their daughter, but doing nothing for the infant.
The Defense’s Gambit: Mental Health and Limitations
The defense strategies attempted to shift responsibility and blame. At Zachary Koehn’s trial, his attorneys argued that he had entrusted Sterling’s care to Harris and worked such long hours that he did not notice the neglect. This argument collapsed under evidence. Koehn was present frequently enough to observe Sterling’s condition. He had chosen to do nothing.
In Cheyanne Harris’s trial, her defense argued she suffered from postpartum depression and severe substance abuse, conditions allegedly preventing parental care. The defense called Dr. Michael O’Hara, a University of Iowa psychology professor, to testify that Harris’s mental health had impaired her ability to function as a parent.
The Bianchi Law Group’s analysis emphasized a critical principle: mental health conditions cannot erase objective facts. A parent’s depression does not explain why a baby was left in the same diaper for more than a week, or why flies laid eggs and hatched maggots on Sterling’s body, or why he was not fed adequately.
The Verdicts and the Question of Murder
Juries in both cases reached guilty verdicts for first-degree murder and child endangerment resulting in death. Zachary Koehn’s jury deliberated less than an hour before returning a guilty verdict in November 2018. Cheyanne Harris was similarly found guilty and sentenced to life in prison without parole in February 2019. Under Iowa law, first-degree murder carries mandatory life imprisonment without possibility of parole.
The murder convictions, rather than lesser charges such as involuntary manslaughter, reflected juries’ findings that Koehn and Harris had acted with extreme indifference to human life. They had not struck Sterling. They had not poisoned him. They had simply left him to die slowly, his body deteriorating day after day while they made conscious choices to deprive him of care. The prosecution proved that both defendants understood Sterling needed food, clean diapers, and basic care. Both defendants had the means and ability to provide these things. Both defendants deliberately chose not to provide them, knowing that such deprivation would result in Sterling’s death. This constitutes murder under Iowa law.
Legal Standards and Parental Duty
The Sterling Koehn case emphasizes a legal principle stressed in Bianchi Law Group’s commentary: parents have an affirmative duty to provide food, shelter, medical care, and basic hygiene to their children. This is not merely a moral obligation but a legal obligation enforceable through the criminal justice system. When a parent deliberately or with extreme indifference fails to provide these necessities, resulting in death, that conduct can constitute murder.
Defense attorneys argued their clients’ actions did not rise to the level of murder. The courts disagreed. Facts supported the conclusion that both Koehn and Harris had made conscious decisions leading to Sterling’s death. They chose to attend to themselves, their other child, and their own drug use while Sterling deteriorated in a dark room.
Murder by Omission: The Legal Principle
One of the Bianchi Law Group’s key points in analyzing the Sterling Koehn case involved the concept of murder by omission. In most criminal contexts, the law distinguishes between affirmative acts and failures to act. A person generally has no legal obligation to rescue a stranger drowning in a pool. But parents are different. Parents have a legal and moral duty to provide life-sustaining care to their children. This duty is absolute and non-negotiable. When a parent deliberately fails to fulfill this duty, knowing that failure will result in death, that failure can constitute murder.
The Bianchi Law Group emphasized that this principle applied squarely to the Koehn case. Neither Zachary Koehn nor Cheyanne Harris needed to lift a hand to harm Sterling. They did not need to beat him, shake him, or poison him. They simply needed to do nothing, and by doing nothing, by deliberately withholding the most basic care, they caused his death. The law recognizes this as murder because the parents had a legal duty to act, they knew they had that duty, they knew Sterling would die without that care, and they deliberately chose not to provide it.
The Impact and Ongoing Questions
The Sterling Koehn case remains a stark reminder of infants’ vulnerability to parental neglect and serious consequences when parents fail fundamental duties. Both parents serve life sentences in Iowa prisons. Cheyanne Harris lost custody of her surviving daughter. The Iowa Court of Appeals upheld both convictions.
The case raised questions in the Iowa legal community about mental health defenses in murder cases and appropriate responses when a child dies from prolonged, deliberate indifference. The Bianchi Law Group’s engagement with this case, through its analysis, highlighted how criminal law grapples with the worst human behavior, calculated, ongoing neglect that treats a child as less worthy of care than any animal.
Sterling Koehn had a life ahead. He should have grown, learned, and experienced love. Instead, he experienced suffering and died before completing four months of life. The criminal justice system’s response, convicting his parents of murder and sentencing them to life in prison, represents society’s judgment that what occurred was not merely tragic but criminal, not a parenting failure but fundamental abandonment of basic human responsibilities.
