The victim was 16 years old when the alleged crimes occurred, the Snohomish County Sheriff’s Office said. He is now 17.

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A Lynnwood High School teacher has been arrested for investigation of sexual misconduct with a 17-year-old male student, the Snohomish County Sheriff’s Office said.

The 25-year-old woman was arrested Wednesday morning after detectives served a search warrant at her home in the 2000 block of 196th Street Southeast, the Sheriff’s Office said in a news release.

The victim was 16 and was enrolled in a class taught by the teacher when the alleged crimes occurred, according to the Sheriff’s Office.

“During the course of the investigation, detectives learned that the suspect and victim developed a relationship which, over time, became sexual,” the sheriff’s office said.

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The teacher was identified as Olivia Sondheim, who was placed on leave early last week when the Edmonds School District became aware of the allegations, said district spokeswoman Debbie Joyce Jakala. Sondheim is a choir teacher, according to the school’s website.

The district alerted the school’s resource officer, a sheriff’s deputy, after the allegations came to light, the Sheriff’s Office said. The allegations were then reported to the sheriff’s Special Investigations Unit, which investigates crimes against children.

The suspect has been booked into the Snohomish County Jail on investigation of first-degree sexual misconduct with a minor.