Back in August of 2016, a federal magistrate judge ruled in Dasseys' favor, agreeing that his confession to the murder had been coerced and was therefore inadmissible. The ruling states that Dassey's confession to helping his uncle rape and kill Halbach was involuntary under the Fifth and Fourteenth Amendments to the U.S. Constitution.
A three-judge panel from the 7th U.S. Circuit Court of Appeals said in its majority opinion that Dassey should be released unless the state of Wisconsin decides to retry him within 90 days or appeals to the U.S. Supreme Court.
Dassey is represented by attorneys Laura Nirider and Steven Drizen of the Center on Wrongful Convictions of Youth.
"We are evaluating the 2-1 decision from the court", said Johnny Koremenos, director of communications and public affairs for the Wisconsin Department of Justice. "7th Circuit AFFIRMS Judge Duffin in 2-1 decision".
The same court that sided with Dassey Thursday also denied his request last summer to be released while the DOJ's appeal was pending before it.
Dassey, who has been incarcerated at a state prison in Wisconsin, serving a life sentence, later recanted.
A three-judge panel from the Chicago-based 7th Circuit upheld the magistrate's decision to overturn his conviction.
He added, "We continue to send our condolences to the Halbach family as they have to suffer through another attempt by Mr. Dassey to re-litigate his guilty verdict and sentence".
Dassey was 16 years old when he was questioned - and later charged - in connection with Halbach's murder.
Avery trial attorney Jerry Buting tweeted, "Hurrah!"
January 30, 2007: A judge says defense attorneys can tell jurors that Avery was wrongfully convicted of rape and may use as evidence a vial of his blood found unsecured in the Manitowoc County courthouse.
The majority opinion states, "Dassey's interview could be viewed in a psychology class as a flawless example of operant conditioning".
Dassey could be freed, or the state of Wisconsin could seek to re-try him.
June 1, 2007: Avery is sentenced to life in prison with no possible parole.
The ruling marks a major victory for Dassey, now 27, whose confession became a key subplot in the series. The discussion about his nephew, Brendan Dassey, however was much less conflicted. If a police officer says to someone who's being interrogated, "let's get it all out today, and this will be all over"...