Yamhill Co. Sheriff's Office
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News Release
Carlton Photographer Indicted on Multiple Counts of Sexual Assualt (Photo) - 02/06/19

The Yamhill County Sheriff’s Office and the FBI, in conjunction with the Carlsbad (California) Police Department are asking for the public’s help in identifying potential victims of a suspected serial sexual predator named Robert Arnold Koester, 52 years of age.  Koester has property in the 16000 block of NW Meadowlake Road in rural Carlton.  His residence and outbuildings were used as photography studios.  It is believed that Koester sexually assaulted both minor and adult females and has potentially been engaging in these criminal acts since 1994. 

Koester, who has also used the names “Bert Kay”, “Rhake Winter” and “Qitooly”, was arrested by the Carlsbad Police Department on November 13, 2018 on sex related crimes under California criminal code.  He remains in custody and has since been charged with two federal counts of production of child pornography based on an FBI investigation in Southern California.

Last week, a Yamhill County Grand Jury charged Koester with 32 felony counts, involving four separate victims, one of which was a minor.  His bail is $2.5 million dollars on multiple counts of the following:

Rape in the First Degree

Sodomy in the First Degree

Unlawful Sexual Penetration in the First Degree

Causing Another Person to Ingest a Controlled Substance

If you have information about this ongoing investigation or believe you or someone you know may have been victimized by Robert Arnold Koester, the FBI and the Yamhill County Sheriff’s Office requests that you complete a secure, confidential online questionnaire.   This questionnaire can be found at:


This questionnaire is only intended to collect information. Based on the responses provided, the FBI or other Law Enforcement Agency will contact you for additional information, if needed.

Identified victims may be eligible for certain services and rights under federal and/or state law. 

Additional Resources:

FBI Help for Victims Brochure

Caring for Kids: What Parents Need to Know About Sexual Abuse

Adult Survivors of Childhood Sexual Abuse

Suicide Prevention Lifeline

American Psychological Association resources on sexual abuse

Rape, Abuse, & Incest National Network (RAINN)

National Center for Victims of Crime

Information from the public may also be submitted confidentially via e-mail to: ModelCase@fbi.gov

Attached Media Files: koester3 , koester2 , koester1
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