Idaho Father Charged with Murder After Killing 18-Year-Old Daughter and Wrapping Her Body in Pride Flag

Authorities in Caldwell, Idaho, are investigating the killing of 18-year-old Hope “Onyx” Cornish, whose body was discovered wrapped in a Pride flag on August 19, 2025, after her father allegedly confessed to her murder. Police responded to reports of an armed man at the Cornish family residence, where Onyx was found deceased. Her father, Delbert Cornish, 51, was arrested later that evening and charged with first-degree murder and aggravated assault, according to official court records and local police statements .

According to the arrest affidavit reviewed by multiple news outlets, Delbert Cornish admitted to shooting his daughter in the head after she opened her bedroom door. He reportedly watched as she struggled for breath for nearly 20 minutes before she died. Cornish later stated to investigators that he draped her body in a Pride flag, claiming it was intended to “honor” her because he believed it would have been meaningful to her. He then fled the scene but was apprehended in Mountain Home and transferred to Canyon County jail .

The affidavit also reveals that Cornish had allegedly considered a murder-suicide involving himself and his children since the previous year. He cited ongoing bullying and belittlement by his own brother, who lived with the family, as a contributing factor. Cornish claimed these circumstances led to his actions, referencing repeated verbal abuse directed at his children with slurs such as “pedophile” and “loser.” However, law enforcement officials have not yet released further details regarding the family’s dynamics or any previous reports of abuse .

In addition to the homicide, Cornish reportedly killed the family’s cat, destroyed property inside the home with a hatchet, and left behind a written confession alongside notes expressing intent to take his own life .

The victim, Hope “Onyx” Cornish, is remembered by her family as a “very loving and strong young woman.” Her mother, Crystal Thompson, described her as a fiery, stylish, and kind person. A GoFundMe campaign has been launched to assist with funeral expenses and support for the surviving family members, with hundreds of donors expressing condolences and celebrating Onyx’s vibrant spirit .

Community members and LGBTQ+ advocates have begun to circulate tributes to Onyx on social media, emphasizing her importance to friends and the broader LGBTQ+ community. Many have also voiced outrage and sadness at the circumstances of her death, urging for increased resources and support systems for LGBTQ+ youth facing familial rejection or violence .

The killing of Onyx Cornish has reignited conversations nationwide about the vulnerabilities faced by LGBTQ+ youth, especially those living in unsupportive or hostile environments. Advocacy organizations continue to highlight the disproportionate risk of violence, rejection, and mental health challenges among LGBTQ+ young people .

National and local LGBTQ+ groups have called for robust interventions—such as crisis hotlines, safe housing initiatives, and educational outreach—to protect youth and prevent similar tragedies. “Every LGBTQ+ young person deserves safety and affirmation, especially at home,” said a statement released by a leading advocacy group after Onyx’s death .

Further, the symbolism of the Pride flag in this case has prompted difficult discussions. While Cornish claimed he used the flag to “honor” his daughter, LGBTQ+ leaders and commentators have condemned such actions as a profound distortion of the flag’s meaning as a symbol of love, diversity, and acceptance .

Delbert Cornish remains in custody and faces charges of first-degree murder and aggravated assault. He is expected to appear in court for a preliminary hearing on September 3, 2025. The Cornish family, as well as the broader Caldwell community, continues to grapple with the aftermath of this tragedy, as the criminal justice process unfolds .

As the investigation continues, local authorities and national LGBTQ+ organizations are urging anyone experiencing familial violence or in need of support to reach out to available resources, including The Trevor Project and local crisis centers .

The outpouring of grief and calls to action in the wake of Onyx’s death highlight the ongoing need for inclusive, affirming spaces and services for LGBTQ+ youth. Advocates emphasize that tragedies such as this are both deeply personal and indicative of broader systemic issues that demand urgent attention from lawmakers, mental health professionals, educators, and community leaders .

Onyx’s memory, as shared by her loved ones, stands as a testament to the resilience and vibrancy of LGBTQ+ youth everywhere. Community members are encouraged to honor her by supporting LGBTQ+ organizations, amplifying affirming narratives, and working to ensure that every young person can live authentically—and safely.