Duluth, MN (KROC AM News) - A former Duluth middle school teacher has been sentenced to 12 years in prison for sexually assaulting a 15-year-old student.

Sentenced Thursday was 34-year-old Karla Winterfeld, who admitted she had engaged in sexual acts with the male student at her home several times in May.

She pleaded guilty to 1st degree criminal sexual conduct.

Police say evidence in the case included recordings of the sex acts.

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