PENDLETON, Ore. — The FBI is asking for help to identify additional victims of a man who recently pleaded guilty to sex abuse charges on the Confederated Tribes of Umatilla Reservation.

Aaron William Pizer, 41, pleaded guilty to two counts of sexual abuse of a minor and one count of abusive sexual contact, the FBI said. Local law enforcement arrested him on May 30, 2024.

According to court documents, Pizer sexually abused two people under the age of 16 on or between July 10, 2016; July 9, 2017; and on or between Aug. 22, 2019 and Aug. 21, 2020, the FBI said. He also engaged in sexual contact on the reservation with a person under the age of 16 on April 19, 2024, the agency added.

The FBI believes Pizer may have assaulted or contacted additional victims both on and off the reservation.

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