'Notable' Wisconsin inmate allegedly confesses to 'Making a Murderer' killing

A convicted murderer in Wisconsin allegedly confessed to killing Teresa Halbach, the photographer whose 2005 death gained renewed interest with the release of the Netflix docuseries "Making a Murderer."

Halbach was killed on Halloween night after visiting the property of Steven Avery, who along with his nephew, Brendan Dassey, was convicted of the murder. Both have said they are innocent.

A second docuseries on the case, "Convicting a Murderer," is currently in the works by director Shawn Rech.

During a recent interview with Newsweek, Rech said as his crew was filming the series, they were given the alleged confession by a "notable convicted murderer from Wisconsin." Rech did not name the inmate and did not disclose what the confession said.

"We haven't confirmed the legitimacy of the confession, but seeing as it was given by a notable convicted murderer from Wisconsin, we feel responsible to deliver any and all possible evidence to law enforcement and legal teams," he said.

"Having been in production for 20 months, we've uncovered an unfathomable amount of information and evidence that is leading us to the truth. Our investigation does not end here," he continued.

The Manitowoc County Sheriff's Office did not immediately return NBC News' request for comment.

Avery's lawyer, Kathleen Zellner, said in a tweet Monday that her office has received the handwritten confession but "it is worthless unless it is corroborated." Laura Nirider, an attorney for Dassey, tweeted that they are aware of the alleged confession and did not offer any further comment on it.

Related: Steven Avery and Brendan Dassey — ‘Making a Murderer’ convictions

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Steven Avery and Brendan Dassey -- 'Making a Murderer' convictions
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Steven Avery and Brendan Dassey -- 'Making a Murderer' convictions
Brendan Dassey is pictured in this undated booking photo obtained by Reuters January 29, 2016. Manitowoc County Sheriff's Department/Handout via Reuters THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS
Steven Avery is pictured in this undated booking photo obtained by Reuters January 29, 2016. The television documentary "Making a Murderer," -- from the case against Avery and Brendan Dassey, who were convicted of killing freelance photographer Teresa Halbach in 2005 -- has put Manitowoc on the map. REUTERS/Manitowoc County Sheriff's Department/Handout via Reuters THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS
A mural of a Budweiser bottle and two Budweiser cans painted on a malt plant overlooks downtown Manitowoc, Wisconsin, January 18, 2016. The television documentary "Making a Murderer," -- from the case against Steven Avery and Brendan Dassey, who were convicted of killing freelance photographer Teresa Halbach in 2005 -- has put Manitowoc on the map. Picture taken January 18, 2016. REUTERS/Brendan O'Brien
Federal appeals court upholds ruling that overturned the murder conviction of Brendan Dassey, from "Making a Murder… https://t.co/qRs1JfDkXW
:: BREAKING NOW: Federal appeals court rules 2-1 Brendan Dassey conviction should be thrown out. #MakingAMurderer https://t.co/IoNCslNcaH
Federal court upholds decision overturning #MakingAMurderer subject Brendan Dassey's conviction… https://t.co/vwAY3OEJbB
Judges affirm "Making a Murderer" confession was improperly obtained, Brendan Dassey should be released from prison… https://t.co/J2DmNC1MRH
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Both Avery and Dassey were given life sentences in 2007 for Halbach's murder. Dassey was 16 when he told investigators that he helped his uncle rape and murder the photographer and then dispose of her body.

No physical evidence linked Dassey to the crime but he was convicted on his statements to two investigators, which some have argued were improperly obtained. Lower courts found that Dassey's confession, which was done without a lawyer or his mother present, was involuntary, but in June 2018 the 7th U.S. Circuit Court of Appeals in Chicago upheld the conviction. Avery is continuing the appeal process.

Both have said that they were framed for the murder by officers who were angry with Avery for suing the county over his wrongful conviction for a sexual assault. Avery spent 18 years in prison for that case before DNA proved he did not commit the assault.

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