A Wisconsin prison inmate pleaded guilty Tuesday to helping his cellmate, a convicted killer, commit suicide by hanging himself from their bunk bed. Under the deal, Walters pleaded no contest to one count of assisting in the Jan. 10, 2009, suicide of 20-year-old Adam Peterson in their cell at Dodge Correctional Institution in Waupun. Peterson, a native of Stillwater, Minn., who had dropped out of the University of Wisconsin-Madison, died of asphyxiation.
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