(CNN) Prosecutors in California plan to drop charges against a surgeon and his girlfriend who were accused of drugging and raping women, Orange County District Attorney Todd Spitzer said Tuesday.

Dr. Grant Robicheaux, 39, and Cerissa Riley, 32, had been charged in September 2018 by the county's previous district attorney of using their "good looks, charm" and drugs to lure women home to rape while they were unconscious or semiconscious.

The couple and their attorneys had repeatedly denied the accusations.

The case made international headlines and was an issue in the 2018 election for district attorney, when Spitzer challenged incumbent Tony Rackauckas.

Grant Robicheaux and Cerissa Riley

Spitzer said a team of prosecutors he assigned to review the case after he was sworn into office concluded there was insufficient evidence to prove the cases beyond a reasonable doubt.

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