Avery murder conviction

Steven Avery, right, is escorted into a Manitowoc County Courtroom for his preliminary hearing Tuesday, Dec. 6, 2005, in Manitowoc, Wis. Avery is charged with killing Teresa Halbach. Charred bone fragments, blood and DNA are all key parts of the murder case against Avery who served 18 years in prison for rape before genetic testing won him his freedom two years ago. (AP Photo/Morry Gash)

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