Chicago (CBS) — The man accused of kidnapping 13-year-old Jayme Closs is expected to plead guilty in Wisconsin Wednesday.

Jake Patterson, 21, is charged with kidnapping, homicide and armed burglary.

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Patterson is accused of kidnapping Jayme after killing her parents last October. Closs was able to escape after 88 days.

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In a letter to a Minneapolis TV station, Patterson says he intends to plead guilty but neither his attorneys nor prosecutors have commented on Wednesday’s arraignment hearing.