HILLSBORO, Ore.- On February 27, 2019, Jeffery Wayne Tiemann was sentenced to 100 months in prison. Tiemann pleaded guilty to First Degree Sex Abuse, Second Degree Sodomy and Encouraging Child Sex Abuse in the Second Degree. The defendant was sentenced by Judge Charles Bailey. The case was prosecuted by Deputy District Attorney Allison Brown and investigated by Washington County Sheriff’s Office Detective Jessica Zieman.

The investigation began in February of 2018 after the 13-year-old victim met Tiemann through a social media app. They began communicating and the victim alerted Tiemann that she was underage. The two eventually met in person where Tiemann sexually abused the girl.

Later that day, the victim’s mother found the messages on her phone and called law enforcement. Tiemann admitted to using the app and communicating with the child but denied he knew her true age.

Police seized his phone. Investigators found images and videos of child pornography.

We would like to acknowledge the Washington County Sheriff’s Office for their thorough investigation on this case. Credit also goes to the victim’s mother who took the time to check her daughter’s phone. We encourage all parents to do the same and to be aware of what their children are doing online.

“Crimes against children that occur online are particularly difficult for law enforcement to detect and enforce,” Deputy District Attorney Brown said. “The crimes this defendant committed against this child would not have come to law enforcement’s attention without the diligence of this child’s mother.”

Tiemann will be transferred to the Oregon Department of Corrections to begin serving his sentence.