Avery, carry out the rape and murder of 25-year-old photographer Teresa
Halbach in 2005.
She was killed after she went to the Avery family car salvage yard to photograph some vehicles.
Dassey was arrested when he was 16, but his attorneys said his confession was coerced.
judge William Duffin ruled on Friday that investigators had made false
promises to Dassey that he “had nothing to worry about”.
ruling said the “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 US Constitution.
The US District
Court in Milwaukee, Wisconsin, ordered that Dassey, now 26, should be
freed within 90 days unless the case is appealed.
The state Department of Justice, which handled the case, did not immediately comment.
Avery was convicted separately in the homicide and is serving a life sentence. He is pursuing his own appeal.
The uncle – who maintains his innocence – had previously served 18 years for a rape he did not commit.
Dassey’s case became a cause celebre with the popularity of Netflix’s series.
filmmakers cast doubt on the legal process used to convict Avery and
Dassey, but prosecutors said the 10-hour series was biased.
lawyer, Kathleen Zellner, said she visited him in prison on Friday and
he told her he was “so happy” his nephew had been exonerated.
Ms Zellner said she is confident Avery’s conviction will eventually also be overturned “when an unbiased court” reviews it.
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