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LONGMONT - A Longmont police officer, Christopher Martinchick, has been arrested for two counts of sexual assault, a class-three felony, and two counts of criminal invasion of privacy for sexual gratification, a class-one misdemeanor.

An arrest warrant was issued on Monday for Martinchick, and he turned himself in on Wednesday at the Larimer County Jail.

The victim is an adult female. Longmont police say the two knew each other but they wouldn't elaborate.

An arrest warrant affidavit says he is accused of photographing the woman and having sexual contact with her while she was asleep.

On one occasion, the victim awoke in pain after taking prescribed muscle relaxants and Nyquil the night before.

The arrest affidavit says Martinchick's cell phone contained 22 photos depicting the victim naked, including some that "depict digital intrusion" of the female.

"It turns everyone's stomach involved, to think of this happening to any individual, let alone the mere thought that someone who swore an oath to protect their community would have committed these acts," Larimer County sheriff Justin Smith said.

Once the investigation determined that the suspect was a Longmont officer, the Longmont Police Department was immediately contacted and has cooperated fully with the investigation.

"I'm honestly disappointed at the thought that a peace officer would victimize somebody in the way that was described to us in this crime," Smith said.

The incidents happened off-duty, Smith said.

Martinchick will be in court on Friday, July 19. He is being held on a $25,000 bond.

This is not Martinchick's first run in with the law. He was arrested in 2009 in Loveland for a DWAI. That charge was later dropped when he pleaded guilty to careless driving.