Brendan Dassey has had his conviction overturned Friday for the 2005 murder of Teresa Halbach in Manitowoc County, Wisconsin, according to multiple reports. Dassey, along with his uncle Steven Avery, was a key figure in the Netflix documentary "Making A Murderer" that captivated millions of viewers. 

According to multiple reports, the decision from federal Magistrate William Duffin in Milwaukee states that Dassey must either be released within 90 days or once again brought to trial. 

Dassey had been sentenced to life with no parole for 41 years after he was convicted in 2007 of first-degree intentional homicide, second-degree sexual assault and mutilation of a corpse, according to WISN.

Fans of the documentary — which, in general, was seemingly skeptical that Avery or Dassey was responsible for the murder — were particularly critical of Dassey's conviction. He was 16 at the time of the murder.

The court found the confession from Dassey was unconstitutional. "The investigators repeatedly claimed to already know what happened on October 31 and assured Dassey that he had nothing to worry about," read the judge's decision, according to court documents. "Those repeated false promises, when considered in conjunction with all relevant factors, most especially Dassey’s age, intellectual deficits, and the absence of a supportive adult, rendered Dassey’s confession involuntary under the Fifth and Fourteenth Amendments."

Investigators told Dassey at least 21 times that they knew exactly what happened to Halbach and the judge felt that would have had a significant effect on the teen, according to Business Insider.

Legal experts have said they expect Duffin's decision to be appealed, according to the Milwaukee Journal Sentinel. The documentary detailed how Avery had been wrongfully convicted in a rape case and served 18 years in prison before he the 2005 incident. As the 10-part series went on scrutiny over the murder case built, "prompting armchair sleuths to flood social media," as CBS News put it