The plea was the result of an agreement with Pierce County prosecutors who had originally charged Aleesha Walker with first-degree murder.
KOMO-TV reported the 28-year-old will be sentenced Sept. 6 in Tacoma.
Little Noah Walker was smothered. His mother told the dispatcher last March that voices in her head told her to hurt her child.
Information from: KOMO-TV, http://www.komotv.com/
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