Kendall County Sheriff's Office booking photo.
The killing of a mother and a family dog in a quiet Kendall County community has ended with a prison term that will likely define the rest of the defendant’s adult life. Illinois resident Cody Sales has been ordered to serve roughly three decades behind bars for attacking his 62-year-old mother with a hammer and also killing the household pet inside their Plattville home.
The case, which wound through the courts for more than three years, has forced a small town to confront the collision of brutal violence and serious mental illness. Jurors ultimately found Sales guilty but mentally ill, and the judge’s sentence tries to balance punishment, treatment and the lingering grief of a family that lost both a parent and a beloved dog in the same night.
The attack in Plattville and the long road to a verdict
Investigators say the violence unfolded inside a house in PLATTVILLE, IL, where 62-year-old Nancy Sales and lived with her adult son. According to prosecutors, Cody Sales used a hammer to beat his mother to death, then also killed the family dog during the same eruption of violence, turning an ordinary evening in Plattville into a crime scene that stunned neighbors and first responders alike. When deputies arrived, they found both victims dead and Sales gravely injured from what authorities describe as multiple self-inflicted stab wounds.
Earlier charging documents laid out how the then 26-year-old Illinois man was discovered in KENDALL COUNTY, Ill, suffering from serious injuries that investigators believed came from stabbing himself after killing his mother and the dog, before he was transported to a hospital under full-time guard, according to an earlier report. The brutal details, including the use of a hammer and the killing of the dog, would later be central to the prosecution’s narrative as they argued that the attack was intentional and sustained, not a brief loss of control.
Guilty but mentally ill, and a sentence that stretches decades
After years of pretrial delays and mental health evaluations, a Kendall County jury returned guilty verdicts on first degree murder and related counts, finding that Cody Sales was guilty but mentally ill for killing his mother and the family dog in PLATTVILLE, a conclusion that acknowledged his psychiatric struggles without excusing the violence, according to coverage of the jury’s decision. That verdict set the stage for a sentencing hearing where relatives, prosecutors and defense attorneys all tried to convince the judge how much weight to give to his mental illness versus the horror of the crime.
In the end, the court ordered that Cody Sales, 30, serve a total of 30 years in prison for killing his mother and the family dog, with the terms to be served consecutively but capped under Illinois law so that the practical effect is a nearly 30 year stretch behind bars, according to sentencing summaries. Prosecutors highlighted that the attack involved a hammer and repeated blows, while the defense leaned on psychiatric records as they argued that serious mental illness played a major role, a tension reflected in the guilty but mentally ill finding noted in court filings.
Mental illness, family grief and a small town’s response
The guilty but mentally ill designation means Sales will be required to receive treatment while incarcerated, a point that has been emphasized in multiple accounts that describe how Cody Sales was and will be under the care of state prison health services. That status does not shorten his sentence, but it does formally recognize that his mental health was a factor, something that may matter to a family trying to make sense of why a son turned on his own mother with a hammer. It also feeds into a broader debate in Illinois about how the criminal justice system handles defendants whose illnesses are serious enough to drive violent behavior but not enough to meet the legal threshold for insanity.
For relatives of Nancy Sales, the legal nuances do not erase the loss of a 62-year-old mother and the family dog, or the fact that the killer was someone she had raised. Kendall County State’s Attorney Eric Weis has framed the outcome as a measure of accountability for a small community that watched the case unfold from the first emergency calls to the final sentencing, with his office detailing how the 30-year term reflects the gravity of the hammer attack and the killing of the pet in public statements. In YORKVILLE, where the courthouse sits, the case has become a reference point in conversations about domestic violence, mental health treatment and how much safety a long prison sentence can really promise.
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