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In a 2019 affidavit, Brad, 37, claimed Barb told him she had hired a person to "reformat" the computer. Now, Brad has told The Sun Online that Steven is "innocent" and he believes his stepmother "sacrificed Steven and Brendan for Scott and Bobby".
"We were driving up to see Brendan when he when he was in custody [in 2006]. I was in the backseat of some black vehicle with Barb," he said.
"She asked: 'If somebody erases your computer is the stuff really gone? Is it, for sure, gone?' And I said: 'Well, no.' I told her the truth. Someone can run special software and get all that stuff back and see what you did."
Barb denies any misconduct or wrongdoing and according to The Sun has taken out a restraining order against Brad.
The allegations are significant because earlier this month, Steven Avery's lawyer Kathleen Zellner made a groundbreaking revelation that places Steven's nephew, Bobby, at the scene of the crime.
A new court filing on 13th April states that a delivery driver has come forward and said he saw Bobby with an unidentified, bearded man in his 50s-60s pushing a Toyota RAV-4 onto the Avery property in the early hours of 5th November 2005.
On 14 April, Zellner tweeted: "To all the Steven Avery supporters: Thank you for all the tips on the accomplice. We should have him identified very quickly."
Added to that, court documents filed by Zellner allege that both Bobby and Barb's husband, Scott Tadych lied in their testimonies.
"Current post-conviction counsel is providing this court with new evidence which establishes that Ms Halbach and her vehicle left the Avery property," the doc states.
"That Bobby Dassey gave false testimony about Ms Halbach and her vehicle not leaving the Avery property. That Bobby Dassey and Scott Tadych gave false testimony establishing the other's alibi.
"That the Dassey computer contains images of Ms Halbach, violent pornography and dead bodies of young females viewed by Bobby Dassey at relevant time periods before and after the murder of Ms Halbach."
Most recently, on Friday 23rd April, Steven's lawyers have accused the State of Wisconsin of 'withholding' crucial evidence in the case.
They said: "It is the State's pattern of concealing and withholding exculpatory evidence that has forced Mr. Avery to delay his appeal numerous times. Already, delaying his request for a new trial and eventual freedom."
Steven and Brendan are both serving life sentences for the death of Teresa Halbach in 2005 but could recent witness evidence clear their names once and for all?
Tyla has contacted a representative for Barb Tadych in response to the allegations.
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