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Steven Avery’s younger brother has just added to the tangled web of unanswered questions surrounding hugely popular Netflix documentary Making a Murderer.

Earl Avery has given his first-ever TV interview, and aired his concerns with the evidence put forward by the prosecution.

Speaking from his Manitowoc home about the night Teresa Halbach was murdered, Earl claimed her car was not even on their land.

“We drove right through there, where that car was supposed to be and it wasn’t there,” he told Access Hollywood. “That night of the 31st, we were rabbit hunting.”

Earl said he told police, but they "didn’t say nothing about it".

(Image: Access Hollywood) (Image: ID)

A search party member eventually found Teresa’s Toyota on their land partially covered by branches.

He also shared his doubts on the lack of blood in the garage where police found a bullet.

"If somebody's going to slice somebody's throat, you know, there's going to be blood - something," Earl said.

"And they say they cleaned up in the garage, but there's all dust and everything all over everything. How do you clean up and then put the dust back?"

(Image: ID)

Meanwhile, Steven's new layer is confident advancements in forensic testing could provide evidence he's innocent of the 2005 murder .

Kathleen Zellner told Friday's edition of Dateline NBC that developments in scientific testing since he was convicted in 2007 could be the key to over-turn his conviction, as well as the testing of evidence that was previously missed.

“Generally, since 2007, there have been significant advances in forensic testing... the clearest way to do this is with scientific testing,” she said.

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“Am I going to tell you exactly what it is? I am not. But it’s been a long time. There was a lot of evidence that wasn’t tested.”

Zellner is famous for overturning wrongful convictions and was hired by Avery after his case became the subject of the Netflix docuseries.

Since Making a Murderer was first released in December, his case and that of nephew Brendan Dassey has been thrust back into the spotlight with millions pouring over the compelling evidence.