Swift Arrest in Homicide Case Highlights Agency Cooperation

Published on August 19, 2025

Today, just after 4:00 p.m., Caldwell Police officers responded to a residence in the 1600 block of Blaine Street after dispatch received a call from a teen who indicated that when he arrived home, his father, later identified as 51-year-old Delbert Cornish, was inside armed with a gun.

When officers arrived, they established a perimeter and made contact with the son outside of the residence. The son indicated that Cornish made comments about shooting a family member and attempted to prevent him from escaping. After a short struggle, the teenage son fled the home unharmed and called 911.

Officers made entry into the residence and conducted a protective sweep for victims and the suspect. At that time, they located a firearm and discovered a deceased 18-year-old female victim. Officers utilized technology and Automated License Plate Reader (ALPR) cameras to quickly identify the whereabouts of the suspect. The search for the suspect led police to a home located in the city of Mountain Home.

At 7:30 p.m., Mountain Home Police arrested Cornish without incident. Caldwell Police detectives, with assistance from the Canyon County Sheriff's Office Crime Scene Lab, will be processing the crime scene in Caldwell. This investigation remains active.

We want to thank the Canyon County Sheriff’s Office, the Elmore County Sheriff’s Office, the Nampa Police Department K9 unit, as well as the Mountain Home Police Department for their assistance.

“My heart is heavy, and I am deeply saddened for the family and friends affected by this horrific act of family violence. I am thankful for the outstanding mutual aid and partnerships with our outside agencies who assisted with identifying and capturing this savage without incident,” said Rex Ingram, Caldwell Chief of Police.