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Ontario Police Department, California
Wednesday September 28th, 2022 :: 07:42 p.m. PDT



Ontario, CA – On September 28, 2022, at 1:22 PM, Ontario Police Officers were dispatched to a domestic disturbance at a home in the 900 North block of Humboldt Ave. Upon arriving, officers located an adult male, later identified as Allen Kao, 50 years old, inside a parked vehicle. Kao was armed with a knife and was uncooperative with officers. Kao claimed he had killed a female victim.

Officers located an unresponsive adult female inside the home. She was transported to a local hospital for medical treatment and was later pronounced deceased. The victim’s information is not available at this time, pending Coroner’s notification to next of kin.

Kao remained barricaded inside the vehicle for several hours, while OPD negotiators attempted to de-escalate the situation. At approximately 4:25 PM, Ontario Police Officers successfully removed Kao from the vehicle and took him into custody. He was treated for numerous self- inflicted knife wounds and transported to a local hospital. Once medically cleared, Kao will be booked into West Valley Detention Center for murder.

Investigators are asking anyone with information related to the incident to contact Ontario Police Detective Ryan Ronveaux at (909)395-1748. Information can also be reported anonymously by calling WE-TIP at (800)78-CRIME or online at

Ontario Police Department, California
2500 S Archibald Ave
Ontario, CA 91761

Emergency: 9-1-1
Non-emergencies: 909-395-2001

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