An Idaho man is accused of killing his daughter and attacking his son in a "horrific act of family violence."

Delbert Cornish, 51, has been charged with first-degree murder and aggravated assault, court records show. He is being held in the Canyon County Jail without bond.

According to court documents obtained by local NBC affiliate KTVB , Cornish had been planning to kill his three children and himself for nearly a year – ever since he bought a black 9 mm Hi-Point handgun in September or October 2024. Then Monday rolled around.

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At a home on the 1600 block of Blaine Street in Caldwell, a suburb of Boise, the suspect took several shots of alcohol ar

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