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A Memphis mother says she is not guilty in the death of her 7-week-old daughter.

Andrea Walker entered the not guilty plea in court Tuesday. Prosecutors charged her with first-degree murder, child neglect, and aggravated child abuse.

She told police her 7-week-old daughter Aniston disappeared in early January after she left the baby at home with her 3-year-old child. Police never found the baby.

On Sunday - more than five weeks after she went missing - a motorcyclist found the baby's body in a ditch.

Walker will next be in court at the end of the month.