MADISON, Wis. -

A judge has appointed a special prosecutor to represent the state of Wisconsin in a request for extensive testing in the case of a man featured in the Netflix series "Making a Murderer."

Court documents show a judge appointed former Milwaukee County Assistant District Attorney Norman Gahn to replace Manitowoc County District Attorney Jaclyn LaBre in Steven Avery's homicide case on Sept. 1 after LaBre cited a conflict of interest.

Avery contends Manitowoc County officials framed him for Teresa Halbach's 2005 death.

His attorney filed a motion in August requesting extensive forensic testing on evidence.

Gahn pioneered DNA use in criminal cases in the 1980s. He garnered attention in the `90s when he filed charges against DNA profiles. He helped prosecute Avery in Halbach's death.