CLARKSTOWN, N.Y. (CBSNewYork/AP) — The charge against a woman accused of killing her mother-in-law in Rockland County has been upgraded to first-degree murder.

Diana Nadell, of Cutler Bay, Fla., was arraigned Wednesday in Clarkstown Justice Court.

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She pleaded not guilty to the murder charge and conspiracy. She was remanded to the Rockland County Jail, Clarkstown Police said.

According to the prosecutor, the murder-one charge was warranted because Nadell allegedly hired someone to help her with the attack on 80-year-old Peggy Nadell.

The alleged accomplice — Andrea Benson, of Washington, D.C. — is charged with second-degree murder and conspiracy.

Diana Nadell is accused of luring her mother-in-law to the door of her Valley Cottage home with a late-night call on Jan. 25. She and Benson allegedly killed her in an attempt to obtain part of her multimillion-dollar estate.

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Two other women — Tanisha Joyner, 26, and Eltia Grant, 24 — are also charged with conspiracy in connection with the case.

Nadell is due back in court on July 14.

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