New trial requested in 'Making a Murderer' case
In Wednesday's filing, Zellner contends that Avery's trial attorneys failed to prove that evidence had been planted because they lacked experts and they did not conduct a thorough investigation.
Officials involved in the case have denied any misconduct.
"Because the State did not need to establish motive, it did not spend any time trying to figure out why Ms. Halbach was murdered," Zellner wrote.
Both Mr. Avery and Ms. Halbach are victims of a justice system whose success depends upon the integrity, competence and devotion of judges, law enforcement, prosecutors, and defense attorneys.
Avery and Dassey contend they were framed by law enforcement angry with Avery for filing a lawsuit against Manitowoc County over his wrongful imprisonment for a sexual assault he didn't commit.