Wisconsin Teen Sentenced to Life for Killing 10-Year-Old Cousin Lily Peters

A Wisconsin teenager has been sentenced to life in prison for the brutal killing of his 10-year-old cousin, Lily Peters, who was found dead in the woods in 2022. Carson Peters-Berger, now 18, pleaded guilty to first-degree intentional homicide on Wednesday, bringing a close to a case that has gripped the community for over two years. He will be eligible for parole after serving 25 years of his sentence.

A Community in Mourning

Lily Peters was reported missing on the evening of April 24, 2022, after she failed to return home from her aunt’s house. Her bicycle was discovered near a wooded area in Chippewa Falls, and the following morning, her body was found. Investigators determined that Lily had suffered injuries consistent with blunt-force trauma to the head. A subsequent forensic autopsy revealed further horrific details, including evidence of manual strangulation and sexual assault.

The discovery sent shockwaves through Chippewa Falls, a tight-knit community where the loss of a child under such violent circumstances left many in disbelief and sorrow. The case quickly escalated, with authorities focusing their investigation on those closest to Lily.

Confession and Plea Agreement

Carson Peters-Berger, who was 14 at the time of the murder, was interviewed by police on April 26, 2022. According to the criminal complaint, he confessed to investigators that he and Lily had been walking along a trail when he suggested they explore the woods. He recounted striking her in the head with a large stick and strangling her until he believed she was dead.

Further details emerged from a Wisconsin Court of Appeals decision, which noted that Peters-Berger had told police he intended to kill and sexually assault Lily before they even left the house. He admitted to attempting to sexually assault her before leaving the scene. The appellate court documents also state that Peters-Berger returned to the wooded area after learning Lily had been reported missing, moved her body, and attempted to conceal it with leaves.

Initially, Peters-Berger faced charges of first-degree intentional homicide, first-degree sexual assault, and first-degree sexual assault of a child under 13 resulting in great bodily harm. However, as part of a plea agreement accepted by Chippewa County Judge Steven Gibbs, the sexual assault charges were dismissed. The plea resolved the case, averting a trial that had been scheduled for November.

Legal Battles Over Court Jurisdiction

Due to the severity of the homicide charge, Peters-Berger’s case was handled in adult court from the outset. His legal team made efforts to have the case transferred to juvenile court, arguing that he would not receive adequate mental health treatment within the adult system. They contended that his age and developmental stage warranted different legal considerations.

Judge Gibbs held a three-day hearing in January 2024 to consider this request. While acknowledging that Peters-Berger had raised valid concerns about mental health treatment availability within the justice system and that keeping the case in adult court wasn’t necessarily for deterrence, he ultimately denied the transfer. The judge determined that moving the case to juvenile court would not adequately reflect the gravity of the alleged crimes.

This decision was later upheld by the Wisconsin Court of Appeals in September 2024. The appellate court found that Judge Gibbs had acted within his legal authority when ruling to keep the case in adult court, affirming the path toward an adult sentencing.

Sentencing and Future Considerations

On August 26, Judge Steven Gibbs formally accepted Peters-Berger’s guilty plea and imposed the life sentence. The sentence means that Peters-Berger will spend at least 25 years in prison before he can be considered for release to extended supervision. This outcome provides a measure of closure for Lily Peters’ family and the community, though the profound tragedy will undoubtedly leave a lasting scar.

The case highlights the complex legal and ethical considerations involved when dealing with juvenile offenders accused of heinous crimes, balancing the need for accountability with concerns about rehabilitation and mental health treatment. For Chippewa Falls, the sentencing marks the end of a painful chapter, but the memory of Lily Peters and the circumstances of her death will remain a somber reminder.