Marybeth Davis

Little Tegan Davis was only 3 years old when her mother poisoned her by giving her a fatal dose of caffeine pills. Her mother Marybeth also caused her infant son permanent brain damage by feeding him insulin. Prosecutors said she was driven by Munchausen syndrome.

Marybeth Davis, 44 years old was sentenced to life in prison, without parole and up to 18 years for poisoning her son Seth.

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