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PHOENIX -- A Peoria woman accused of conspiring with her son and another teenager to kill her husband has pleaded not guilty.

Michelle Gibson entered her plea Monday in Maricopa County Superior Court. The 41-year-old faces a number of charges including first-degree murder in the killing of 39-year-old Steven Gibson Sr. He was found beaten and stabbed in the family garage on March 1.

The couple's 15-year-old son also pleaded not guilty Monday to stabbing his father in the chest.

Court documents said the mother and son are accused of planning the murder at least one week earlier.

According to court documents, Gibson and her husband had been involved in domestic violence incidents.

It was unclear if either had attorneys.

Associated Press,

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