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The defence lawyer who's taken on the Steven Avery case is prepping for a mammoth court battle in a bid to clear the Making of a Murderer star.

Kathleen Zellner is convinced of his innocence and has taken to her twitter account to defend her client who has become the focus of an outcry following the Netflix real life series.

Illinois-based Zellner specialises in overturning wrongful convictions and has not held back launching a blistering attack on prosecutors and police who investigated the death of Teresa Halbach insisting Avery was "framed" for a second time.

After visiting him at the maximum security Waupun Correctional Institution in Wisconsin last week, she said: "He is identical to the other 17 innocent men we've cleared. Won't quit until he's out."

(Image: Getty)

Mr Avery who is now 53 - and spent 18 years in prison for a sexual assault he didn't commit the first time round - has spent the last decade behind bars after being found guilty of the murder of Auto Trader photographer Teresa Halbach in 2005.

Avery and his nephew Brendan Dassey were said to be behind the rape, stabbing, shooting and cremation of 25-year-old Teresa on his property in Manitowoc County, Wisconsin on Halloween, 2005.

(Image: Netflix)

But Zellner is now building a case that she hopes will blow the prosecution's arguments out of the water.

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In a string of tweets she says Teresa's body was not cremated at the burn pit outside Avery's trailer in Two Rivers - as was suggested at the first trial, that the bullet prosecutors claimed killed the young photographer did not enter her head and that the car key found in Avery's bedroom was planted.

Ms Zellner is now pouring over 38 boxes of case files after filing for a new appeal citing violations of due process rights last week.

Her Chicago-based firm has taken on the case pro-bono assisted by Tricia Bushnell, legal director of the Midwest Innocence Project.

(Image: Getty)

She said: "Body was not burned in burn pit because heat would have burned down Avery's garage.

"A lot of junk science at the junkyard."

The lawyer also says the evidence presented at the Jury trial in 2007 to secure the conviction was deliberately miselading.

At the time Wisconsin State Crime Lab gun expert William Newhouse could not testify that a bullet found in a crack in Avery's garage was shot from a .22-caliber rifle seized from his bedroom.

(Image: Collect)

That bullet became key evidence after a state DNA expert said it had Halbach's remnants on it.

Now Zellner says there is no way Teresa was shot in the head with that bullet.

She insisted: "The 22 recovered from garage did not exit Teresa Halbach's head. State expert failed to testify bullet exited--that 22 driven to scene."

And she says she will prove that the key found in Steve's bedroom was planted.

She added: "Culprit had to remove his own DNA from key so Teresa's removed in process.

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"Rub key on Avery's clothes for skin cells. Presto."

Hundreds of thousands of people have backed a petition to demand the Steve and Brendan are given a retrial while The White House recently waded into the debate insisting President Obama wasn't able to pardon them.

While for the first time in history thousands of people are joining in on the evidence hunt thanks to the hysteria created by the show.

Last week Reddit users presented evidence which allegedly shows Steve and Brendan were framed in a "perfect storm" by two separate parties.

They say a photograph of Teresa grasping a set of car keys for her Toyota RAV 4 shortly before her death proves the single key that was picked up in Avery's bedroom was placed there after the fact.

Her car was found covered in debris at Mr Avery's salvage yard six days after she died on November 5th.

Yet only a solitary car key was found in the bedroom of Avery’s trailer on November 8th by police officers who had, under rule of court , no jurisdiction to be there.

Now a new petition, titled "Initiate a Federal Investigation of the Sheriff's Offices of Manitowoc County and Calumet County, Wisconsin", has been submitted to The White House and could lead to yet more probes in the case.

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