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Campaigners say entries on the death certificate used as proof to confirm the death of Teresa Halbach are deeply flawed.

Lawyers acting for Steven Avery are continuing to access thousands of pieces of evidence as prosecutors get set to file their case to keep him behind bars in ten days.

Internet sleuths have uncovered compelling evidence they say could help Avery and his nephew Brendan Dassey - the unlikely stars of the Netflix documentary series - obtain a retrial.

But as the countdown is on and forensic experts pore over DNA evidence in a bid to find the key to getting him out of prison - attention is turning to Teresa Halbach's death certificate.

(Image: Manitowoc County Court, Wisconsin)

The ratified certificate seen by Mirror Online has an number of glaring anomalies, according to campaigners.

Read more : The real story behind Making a Murderer

And some of the dates or times don't seem to add up with key parts of the form being filled in either incorrectly or wrongly, it has been claimed.

(Image: Collect)

Among the bizarre aberrations is the "immediate cause" of death which was initially filled in with the word "undetermined" but has a line drawn through the middle of it.

Another peculiar filing is the fact that the medical examiner has checked the box to confirm that an "autopsy" was completed - but without an intact body being found.

Oddly, the form was completed and signed six weeks before it was even corroborated by the FBI that the DNA was linked to Halbach.

And it was signed off on 6th December 2005 - the same day Steven Avery's preliminary trial began.

The medical examiner has also crossed off the box that says no body was found - even though it claims to have completed the autopsy.

According to historical reports bones belonging to Halbach, the 25-year-old freelance photographer who disappeared October 31 2005, were found in a burn pit and two other locations over an 11 day period after she went missing.

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However, her death certificate records the date of her death as 10th November - meaning that not all of the evidence could have been collected in this time frame.

Police found Halbach's charred remains in a burn barrel along with her mobile phone situated near Avery's trailer.

(Image: 12 WISN ABC)

Investigators also apparently located Halbach's car key in Avery's home - after it was searched repeatedly.

Now campaigner Shaun Attwood says investigators seemed to have filled in the death certificate confirming Teresa's passing without having the information to prove that it was even her remains.

He said: "As usual, looking at the death certificate, nothing adds up in this case.

"There's no murder weapon, no credible DNA, no other suspects were investigated, there's no blood splatter or bodily fluids from an alleged rape, throat slashing and murder in Avery's trailer.

"And let's look at the bone damage, what was left over is beyond anything a bonfire could have caused, it doesn't surprise me in the slightest that the official in charge of the death certificate was unable to fill in the form correctly or for that matter truthfully.

(Image: COllect)

"The fact that the cause of death alone has a line through it is a major red flag.

"Can anyone who's scratched the surface of this case conclusively say exactly how, when and where Teresa died?

"I would argue not, especially since the waters were muddied by the moving and planting of evidence, such as the magical key and the tampering with Stephen Avery's blood DNA from the first wrongful conviction.

"Yet one person claims to know every last detail, and is indeed writing a book about it: the prosecutor Ken Kratz."

Avery, 53, has been back behind bars for more than a decade after being found guilty of the stabbing, shooting and cremation of 25-year-old Teresa on his property in Manitowoc County, Wisconsin on Halloween, 2005.

But new evidence points to the theory that Avery and his 26-year-old nephew - who is said to have learning difficulties and was allegedly coerced into a confession that he raped and aided Teresa's murder - are innocent.

The evidence that has come to light allegedly shows Steve and Brendan were framed in a "perfect storm" by two separate parties.

According to this photograph posted to the website Reddit - Teresa is grasping a set of multiple keys for her Toyota RAV 4 shortly before her death.

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.

(Image: Netflix)

Crucially in the first trial, the defence lawyers argued the key was placed there by Manitowoc County sheriff's officers Lieutenant Lenk and Sergeant Colborn, after the bedroom was searched four times.

Now conspiracy theorists claim this 'proves' the car key was in fact planted, and not the set Ms Halbach used for her day to day travel.

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There is no doubt that DNA evidence confirmed Avery's blood was found in the RAV 4, but his defence lawyer Jerry Buting is now arguing the car key photograph could be the game-changer.

(Image: Collect)

He told Rolling Stone: "Now, we did challenge that, how unusual it was for her to be walking around with one key, but I don't think I caught the fact that there was a photograph showing that what she really carried around was a bunch of keys, and none of those keys were ever found."

In addition to this evidence a new theory posted online suggests that instead of Steve and Brendan being to blame it's Avery's brother-in-law and witness Scott Tadych and nephew Bobby Dassey who are the real culprits.

A Reddit user has posted the most extraordinary details about what they claim happened to Teresa and says the blame is very close to home for the Avery family.

It says: "The police didn't kill Theresa Halbach...What James Lenk and Andrew Colborn, or the others for that matter don't realize at this point and are completely unaware of is that Bobby Dassey and Scott Tadych have kidnapped, raped, shot and then burned Theresa Halbach in the privacy of the gravel quarry off of Jambo Rd on Halloween evening.

"They hid Halbach's car in the rear of Avery Salvage and wiped it clean of their prints.

"By sheer colossal luck, two completely independent frame jobs targeting one man, Steven Avery were shaping up into the perfect storm.

(Image: Netflix)

"On one front, from Lenk and Colborn regarding the RAV4, ....and on the other unconnected front by Scott Tadych and Bobby Dassey regarding the cremains of Theresa Halbach.

"One party wasn't aware of the other's involvements at any point during the days leading up to the official discovery of Halbach's RAV4 at the Avery Salvage Yard hence why the investigation and murder trial made zero sense to anyone especially the Jury."

(Image: Netflix)

Whatever happens this story is not going away anytime soon.

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

Last week Avery filed for a new appeal citing violations of due process rights.

Now lawyer Kathleen Zellner says her Chicago-based firm will take on the case pro-bono-assisted by Tricia Bushnell, legal director of the Midwest Innocence Project.

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