EUGENE, Ore. - The FBI says a suspected serial sexual predator accused of taking nude photographs of models, faces accusations he sexually assaulted many of the women in Oregon, California and elsewhere.
Federal agents and local police departments made a public appeal Wednesday for help reaching anyone who may have been a victim.
The suspect, 52-year-old Robert Arnold Koester, has also gone by the names Bert Kay, Rhake Winter and Qitooly, the FBI said.
Koester owns a farm in Yamhill County, Oregon. A grand jury there indicted him in January on 32 felony counts involving 4 victims, one of whom was a minor. The charges include first-degree rape, first-degree sodomy, first-degree unlawful sexual penetration and causing another person to ingest a controlled substance.
Koester is currently in custody in California. He was arrested in November in Carlsbad, California, where he faces 23 felony counts, including child sexual abuse and production of child pornography.
Koester also faces two federal counts of sexual exploitation of a minor in California based on an investigation by the FBI in San Diego.
"Alleged victims have been identified in multiple cities across the United States," the FBI said. "At the time of his arrest, Koester worked as a professional photographer, engaged in the photography of models, primarily on the West Coast of the United States."
The FBI said Koester may have committed crimes as far back as 1994.
If you or someone you know may have been a victim, the FBI asks you to complete a confidential online questionnaire.
The public can also submit information via email at ModelCase@fbi.gov.
Victims may be eligible for certain services and rights under federal and state laws, the FBI said. More information is available online.