Making a Murderer: Steven Avery's lawyer Kathleen Zellner believes new forensic evidence will prove innocence

'There was a lot of evidence that wasn't tested'

Steven Avery, the subject of the new Netflix documentary

Making a Murderer has gripped viewers around the world, leading to a legion of armchair detectives up in arms about the suspicious trials of Steven Avery and Brendan Dassey.

Having received new-found exposure due to the Netflix documentary, Avery has a new defence lawyer fighting his case, arguing that he did not murder Teresa Halbach in 2005.

In her first TV interview, wrongful conviction specialist Kathleen Zellner has said that advances in forensic testing could clear Avery of any wrongdoing.

"Generally, since 2007, there have been significant advances in forensic testing. The clearest way to do this is with scientific testing," she told Dateline NBC. "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.”

In a separate interview with ABC, she also revealed that tests would be done on the Rav4 where Halbach and Avery's blood was found but no fingerprints.

"I want to examine what was not tested in the car that should have been tested," she said, adding that they are looking into other possible suspects.

Zellner has been using her Twitter account to debunk claims against Avery, also Tweeting out a letter - written by Avery - stating his innocence.

“To my supporters,” it read. “I want every forensic test possibly done because I am Innocent”. Zellner added he was “thrilled about chance of new forensic testing, like innocent men always are”.

In a recent documentary for Investigation Discovery - titled Steven Avery: Innocent or Guilty? - Avery’s prosecutor Ken Kratz spoke about the infamous case, raising new questions about some of the evidence both left out and featured by the show. Read the full story here.