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 killed his older sister, 18-year-old Hope “Onyx” Cornish.
As Lucian would later tell law enforcement, he was in “absolute shock,” Batey said…