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JACKSONVILLE, Fla. -- A Middleburg woman accused of hatching a murder-for-hire plot to have her daughter-in-law killed has pleaded guilty, court records show.

In October 2013, Diana Reaves Costarakis hired an undercover detective posing as a hitman to kill her daughter-in-law, agreeing to pay him $5,000 for the deed, prosecutors said.

During their first meeting, Costarakis, 71, allegedly gave the detective a $500 down payment along with a picture, address and vehicle description of the intended target. When the pair met again later, Costarakis gave the detective another $1,000 and told him he could take her daughter-in-law's "expensive jewelry" as part of his payment, prosecutors said.

Asked if she wanted the victim dead, Costarakis allegedly told the detective, "If you don't, I will."

Last week, Costarakis pleaded guilty to solicitation to commit a capital felony, according to court records. Sentencing is set for September. Costarakis faces 15 years in prison.

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