'Making a Murderer' subject Steven Avery files appeal

MILWAUKEE (AP) -- A convicted killer who is the subject of the Netflix series "Making a Murderer" has filed a new appeal seeking his release.

Steven Avery says authorities used an improper search warrant and that any evidence found as a result "is clearly `FRUIT OF THE POISONIOUS TREE."'

Avery was convicted of first-degree intentional homicide in the death of photographer Teresa Halbach a decade ago. Avery had been wrongfully convicted years earlier in a rape case and served 18 years in prison. He had sued Manitowoc County for tens of millions when he and his nephew were arrested in Halbach's death.

NBC 26 shared the official documents filed in court.

Manitowoc County Sheriff Robert Hermann says he hasn't seen Avery's appeal, which was filed Tuesday. Hermann previously has said that the investigation was proper.

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