THE DALLES, Ore. -- The anesthesiologist from The Dalles accused by several women of sex crimes last year was sentenced Tuesday to 23 years in prison, the Wasco County District Attorney's Office said.

Dr. Frederick George Field was charged in August 2011 with rape and felony sexual abuse. He was indicted by a Wasco County grand jury and accused of abusing two patients.

Investigators said Field took advantage of the women while they were under anesthesia. He worked at Mid-Columbia Medical Center in The Dalles for five years.

Tuesday he changed his plea from not guilty to guilty on several sex abuse charges. The change in plea came after lengthy negotiations between the district attorney and Field's lawyer.

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