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The Seattle police detective arrested for investigation of identity theft posted sexually explicit photographs on a phony Facebook page to “ruin” the life of a woman who had ended an extramarital affair with him, according to court documents made public on Friday.

Some of the photographs were taken while the detective, David N. Blackmer, and the 31-year-old woman were engaged in sexual activity, according to the probable- cause documents released by Snohomish County prosecutors.

Relatives of the woman, her friends and people in her church saw the photos, the woman told Seattle police, according to the documents. She told police she felt “violated” and “degraded.”

Blackmer, 43, was arrested Thursday and booked into the Snohomish County Jail for investigation of second-degree identity theft, a felony. The allegation includes the circumstances of domestic violence because of the relationship, and cyberstalking related to the Facebook posting.

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Blackmer, a 17-year veteran of the Seattle Police Department, was cooperative when arrested, surrendered his badge and gun and was placed on paid administrative leave, police said. If he is charged with a felony, he will be placed on unpaid administrative leave, according to Seattle police.

An Everett District Court judge on Friday afternoon allowed the release of Blackmer without bail. Blackmer said he planned to leave Friday night for a 30-day treatment program in Florida.

Blackmer and the woman began a sexual relationship in December after meeting on an Internet dating website, according to the documents. On July 11 or 12 she ended the relationship, according to the documents.

On July 17, the woman went to Blackmer’s home in unincorporated Snohomish County to tell his wife about their affair, the documents state. While there, the woman said, she argued with Blackmer, who grabbed her by the neck and pushed her to the ground, the documents allege.

While she was walking back to her car, she said, Blackmer told her he would “get back at her” and “ruin her life,” according to the documents.

Within hours of the confrontation she noticed the explicit photos on the phony Facebook page, the documents say.

The woman contacted the Seattle Police Department’s Office of Professional Accountability (OPA) in person, complaining that the counterfeit page had caused her fear, anxiety and embarrassment, Seattle police said Thursday.

OPA investigators turned the case over to detectives in the Special Operations Bureau in light of the criminal nature of the allegations. Bureau detectives worked on the case for several days, developing probable cause for the arrest.

Detectives also took down the Facebook page.

At a hastily called news conference late Thursday afternoon, Sgt. Sean Whitcomb, a Seattle police spokesman, declined to describe the specific contents of the Facebook page while the case remains under review.

But Whitcomb said the page contained “salacious” photographs and wording.

As a result, the woman was concerned about damage to her reputation, Whitcomb said.

All the events between Blackmer and the woman occurred outside of work, Whitcomb said.

“The relationship was on its way out,” Whitcomb said, calling the confrontation a “turning point.”

Whitcomb said the case will be reviewed by the Snohomish County Prosecuting Attorney’s Office to determine if formal charges should be filed.

Detectives are also investigating whether Blackmer assaulted the victim during the July 17 confrontation, police said.

At the conclusion of the criminal case, the OPA will begin a separate administrative investigation into the detective’s conduct.

Steve Miletich: 206-464-3302 or On Twitter @stevemiletich

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