FREMONT — A San Ramon man was sentenced to 20 years in prison for drugging and sexually assaulting multiple women, police said Tuesday.

Kwangmin Jin, 21, pleaded no contest Thursday to six counts of rape while intoxicated, according to Fremont police. He will serve 20 years in prison as part of a plea bargain.

He initially faced 21 separate counts of raping an intoxicated victim and transporting a controlled substance.

Fremont police arrested Jin on Sept. 23 in Champaign, Illinois, on a warrant related to a sex assault investigation with help from University of Illinois Urbana-Champaign police. He was later extradited to Fremont.

Jin used fake names to arrange meetings with women over social media sites between May and August 2015. Police said aliases Jin used include Kevin Park, Kevin Jin, Jeremy Lee and Kevin Lee. He contacted the victims on social media sites such as Tinder, Mocospace, Skout and Facebook.

When he met a woman in person, Jin would give the victim an alcohol drink spiked with Xanax. When the woman fell unconscious, Jin would sexually assault her.

Seven victims have been identified in the Bay Area. Police said there is a possibility that other women have come in contact with Jin, some who may not remember much of their time because they were sedated.

Authorities encourage anyone with additional information on this investigation to call 510-790-6900.

Contact Katrina Cameron at 925-945-4782. Follow her at Twitter.com/KatCameron91.