Prosecutors say the 50-year-old contractor attacked the woman with a stun gun at her Riverside home, handcuffed her, covered her head with a hood, and placed her in a casket-like box inside his van.
The victim's husband returned home to find a ransom letter and photographs of her being restrained.
Warren was arrested and the woman was rescued about seven hours later after a resident spotted a suspicious van.
Warren returns to court for sentencing Nov. 12.
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