Detectives Arrest Caregiver for Sexually Abusing Resident

On Saturday, May 9, 2026, Washington County Sheriff’s Office deputies responded to investigate a sexual assault at a care facility in the Raleigh Hills area. Staff called the police after becoming concerned that a resident was sexually abused by an employee. Deputies responded initially, and a detective from the Violent Crimes Unit was called out to lead the investigation.

Investigators learned the staff member, 25-year-old Oscar Marquez-Alonso, had been employed as a caregiver and had worked at this specific care home for approximately a month. Detectives found evidence that Marquez-Alonso sexually abused an elderly female resident while he was working.

Marquez-Alonso was arrested and lodged at the Washington County Jail on the following charges:

• Sexual abuse in the first degree (two counts)
• Sodomy in the first degree

The investigation is ongoing, and Marquez-Alonso may face additional charges.

Detectives are concerned that there are additional victims. If you are a victim or have additional information, contact the Sheriff’s Office Investigations Division at 503-846-2500 and reference case number 50-26-6407.

The Washington County Sheriff’s Office, by Oregon House Bill 3273, is releasing Marquez-Alonzo’s booking photo to identify additional criminal activity.