A Great Neck attorney faces up to 12 years in state prison after she admitted to stealing more than three-quarters of a million dollars from elderly and mentally incapacitated clients she represented, Queens District Attorney Richard A. Brown said in a statement.

Martha Brosius, 52, is scheduled for sentencing on Aug. 12 and faces 4 to 12 years in prison, Brown said. Brown said Brosius admitted to "breaching her fiduciary duty" and to "unjustly enriching herself at the expense of her clients."

Brosius admitted to stealing $797,000 from clients over a four-year period, Brown said.

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One of the victims was a 77-year-old man who had been deemed "incapacitated" under the mental hygiene law.

Brown said that Brosius, as the victim's appointed guardian, took cash from his account and deposited it into her own account between September 2009 and September 2011.

A forensic review by the district attorney's office "allegedly revealed a pattern of activity whereby funds belonging to the disabled man were taken by Brosius from the guardianship accounts she maintained on his behalf," Brown said in 2013. Brosius pleaded guilty to two counts of second-degree grand larceny and one count of scheme to defraud in an appearance Monday before Acting Supreme Court Justice Helene F. Gugerty, Brown said.

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In addition to her practice in Great Neck, Brosius, an elder law attorney, also maintained a practice in Manhattan.

The Queens district attorney was appointed special prosecutor in the case by then-Nassau District Attorney Kathleen Rice to avoid any appearance of impropriety due to a conflict of interest, according to the statement.

Brosius' attorney was not immediately available for comment.