The Massachusetts attorney general's office says 37-year-old Erika McCauley, of Wilmington, will be arraigned Thursday.
Darryl McCauley is Cook's half-brother and McCauley's husband. He pleaded not guilty in March to larceny and forgery.
Prosecutors say Darryl McCauley stole the money while he was business manager for Cook's company, Great Dane Enterprises. His attorney has said he denies taking money without his brother's consent.
The attorney general's office says it doesn't know who is representing Erika McCauley in court.
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