San Ramon man, 20, arrested in druggings, sex assaults

Kwangmin Jin, 20, of San Ramon was arrested in Illinois. Kwangmin Jin, 20, of San Ramon was arrested in Illinois. Photo: Fremont Police Department Photo: Fremont Police Department Image 1 of / 3 Caption Close San Ramon man, 20, arrested in druggings, sex assaults 1 / 3 Back to Gallery

Operating under fake names, a 20-year-old San Ramon man used Tinder, Facebook and other social networking platforms to lure women whom he then drugged and sexually assaulted, police said Monday.

The lead agency in the case, the Fremont police force, announced the Sept. 23 arrest of Kwangmin Jin in Champaign, Ill., by authorities there who executed a warrant. Jin was awaiting extradition to Alameda County.

According to Fremont detectives, Jin victimized at least four women from May to August, using aliases — Kevin Park, Kevin Jin, Jeremy Lee and Kevin Lee — to meet them on Tinder, MocoSpace, Skout and Facebook.

“Once in person, Jin would give the victims an alcoholic beverage tainted with a sedative drug,” department officials said. “The victims were rendered unconscious for several hours, during which time Jin sexually assaulted them.”

Fremont police said evidence suggests there may be more victims in the Bay Area, and that some “may have little knowledge of the events that transpired due to being sedated.”

Anyone with information is asked to contact Detective Ken Kwok at kkwok@fremont.gov or (510) 790-6900.

Demian Bulwa is a San Francisco Chronicle staff writer. E-mail: dbulwa@sfchronicle.com Twitter: @demianbulwa