Police say the woman showed up at a northeast-area business on Wednesday and said she had escaped after being held captive in a nearby house.
Officers went to the home and arrested a 28-year-old man.
Investigators say the accused and the alleged victim are known to each other and had been in a "domestic partnership" earlier this year.
Troy Jordan Lemke is charged with uttering threats, assault, assault causing bodily harm, sexual assault and forcible confinement.
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