CALDWELL, Idaho (Scripps News Boise) — After disarming his father inside their Caldwell home, 15-year-old Lucian Cornish says he ran for his life down the street — moments after learning his sister, Onyx, had been murdered on Aug. 18.

In an exclusive interview with Scripps New Boise , Lucian detailed what happened that day and how he remembers his sister.

“I remember when I was running away, I thought to myself, ‘Am I dreaming?’ Like, my brain was just going in different directions. This has to be fake,” Lucian said.

(L) Onyx Cornish, (R) Lucian Cornish (Scripps News Boise)

What started as a normal afternoon quickly turned into a nightmare when Lucian got home from school. That’s when his father, Delbert Cornish , allegedly told him he had shot and killed his sister.

“He started

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