‘Onyx Deserved to Grow up’: Idaho Dad Sentenced for Killing 18-Year-Old Daughter

‘Onyx deserved to grow up’: Idaho dad sentenced for killing 18-year-old daughter

Hope “Onyx” Cornish was killed Aug. 18, 2025, in Caldwell. She was 18 years old. | Courtesy Crystal Thompson BOISE (Idaho Statesman) — Lucian Cornish lost his spark on Aug. 18, 2025. When the 15-year-old got home from school that afternoon, he immediately knew something was very wrong, Canyon County Chief Deputy Prosecutor Ingrid Batey said in court Wednesday. His father, Delbert Cornish, asked him about his day and then told him that he’d kille…

Caldwell man sentenced to life for murder of 18-year-old daughter

Delbert Cornish, who was arrested for the murder of his 18-year-old non-biological daughter in August, has been sentenced to life in prison without the possibility of parole.

Delbert Cornish sentenced to life without parole for murder and attempted murder

Delbert Cornish was sentenced to life in prison without the possibility of parole for the murder of 18-year-old Onyx Cornish and the attempted murder of her 15

Delbert Cornish: 'Regret, Anguish and Remorse... For What I've Done'

Delbert Cornish speaks before being sentenced for the murder of his daughter, Hope ‘Onyx’ Cornish. Delbert said ‘I could never muster enough words to convey the amount of regret, anguish and remorse I have for what I’ve done. (1/28/26)

'Pure evil': Caldwell father sentenced to life in prison for the murder of daughter, attempting to kill son

Delbert Cornish was sentenced to life without parole for killing his daughter. Her mother said she wants people to remember Onyx for her life, not for her death.

Caldwell man sentenced to life in prison for the murder of 18-year-old daughter

The Caldwell man who confessed to killing his 18-year-old daughter has been sentenced in Canyon County Court to life in prison with no possibility of parole.Delbert Cornish previously confessed to killing his daughter Hope Cornish, who went by Onyx. He was subsequently charged with first-degree murder, assault with intent to murder, and animal cruelty. Cornish ultimately agreed to plead guilty to avoid the death penalty.WATCH: Delbert Cornish sp…