A 13-year-old boy in Ohio planned for months to kill his neighbor before ultimately doing so and then bragging about the "chilling" crime online, authorities say.

The child, who is now 14, pleaded guilty to aggravated murder , aggravated burglary, and strangulation on Monday as part of a plea deal with prosecutors, per local reporting, including from Cincinnati-based ABC affiliate WCPO . Because of his age, the killer's name has not been released.

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In the early morning hours of Feb. 2, Sheila "Denise" Tenpenny was alone at her home on the 3900 block of Germania Street in Fairfax, a Cincinnati suburb. While she lay in bed, the teen entered her home, s

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