According to legal documents, Cierre Wood admitted to using exercise as a discipline after moving in with his girlfriend for six months.
KTNV Reports Wood told investigators that boyfriend Amy Taylor's daughter, La-Rayah Davis, was "chunky" and on the day she died, forced her to do sit-ups and run.
Court documents say Wood claimed that the girl fell backwards and hit her head while exercising, but Taylor admitted to abusing her daughter before her death.
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Taylor claims she and her daughter were near a school on April 9 when La-Rayah threw a tantrum and beat her mother on hand.
Documents say Taylor strained her daughter and made her stand in a corner at home. But the mother also claimed to sit on her daughter's breast and stomach as punishment sometimes, which resulted in La-Rayah complaining of chest pain.
Wood called 91
When emergency personnel reached the couple's home, they found La-Rayah "cold and stiff." She was pronounced dead in the hospital.
KTNV reports that doctors have found several injuries to the child, including bruises on several parts of her body. La-Rayah also had an increased number of white blood cells, a distended abdomen, a lump on the forehead, a possible bee tag and blood in her underwear.
Wood and Taylor were initially charged with child abuse and neglect, but both are now being charged with murder charges.
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