Sheboygan County Circuit Judge, Angela Sutkiewicz, said that the evidence presented so far, in her opinion, did not warrant a new trial.
The conviction of Avery's nephew, Brendan Dassey, was overturned a year ago.
Avery's legal team isn't giving up yet, though.
This is not the last step in the justice process for Avery.
"Given the totality of evidence submitted at trial and the ambiguous conclusions stated in the experts' reports, it can not be said that a reasonable probability exists that a different result would be reached at a new trial based on these reports", Sutkiewicz wrote in the ruling.
Officials involved in the case have denied any misconduct.
Zellner believes that Hillegas should have been more closely investigated because he had a motive and no alibi for his whereabouts on the day of Halbach's murder.
The Emmy-winning documentary suggested authorities planted evidence against both defendants, a claim rejected by the current sheriff.
'All that really matters here, to us and we hope to everyone, is that we get closer to the truth in this case and to justice for everyone, ' Strang said in an email to the AP.
"The scientific testing is not completed".
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. Then, in June of this year, a judge ruled that Dassey, who was 16 at the time of Halbach's death, had been coerced into confessing, and that he should be either retried or released.
In August, a USA appeals court agreed to reconsider the decision of a federal judge who overturned Dassey's conviction by ruling it was based on a coerced confession he gave as a 16-year-old with a learning disability. The court later determined he should remain in prison while Wisconsin appeals the overturning of his conviction.
The case was the focus of Netflix's 2015 documentary which spawned conjecture about the pair's innocence.