HAYWARD (CBS/AP) — A former Hayward police sergeant faces nine felony counts for stealing more than $450,000 from a mentally ill woman he once arrested.

The San Francisco Chronicle reports that Michael Scott Beal was arrested Monday for grand theft.

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Prosecutors say that Beal, who retired in 2013, met the alleged victim in 2002 when he arrested her for prostitution. The victim said after her arrest he cultivated a relationship with her and she provided sexual favors while he was on duty.

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The victim says she gave Beal $450,000 over the years, eventually investing in a home by paying half the mortgage and property taxes. Beal said they would get married when he retired.

A Hayward Police Department spokesman said they did not know Beal was engaged in any illegal activity.

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