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The Making a Murderer documentary is all anyone can talk about, and with reams of new 'evidence' suddenly appearing all over the internet - it's hard not to get sucked in.

The latest piece of video evidence involves Ken Kratz, the former district attorney of Calumet County, who was heavily involved in the case after Steven Avery was arrested on suspicion of murder in 2005.

In the clip, Scott Tadych, Avery's brother-in-law, takes to the stand to be questioned by Avery's lawyer, Dean Strang.

But as the camera pans across to Ken Kratz, he can be seen subtly moving his finger across his lip, a signal which some viewers believe is directed at Mr Tadych in a bid to stop him from talking.

The apparent hand gesture was brought to light by Twitter user Ian Atkinson who said: "Ooh little, finger symbol there, little symbol to him [Scott Tadych]. 'Shut up Scott'."

Another viewer, who commented on Ian's clip, joked: "Was he telling him to lie, or steal 3rd base? Good catch."

At the time of questioning, Scott was attempting to affirm his alibi, claiming that Bobby Dassey, Steven's nephew, saw him leave the Avery Salvage Yard before the murder of Teresa Halbach allegedly took place.

This clip won't help Mr Tadych, who has already come under some scrutiny after internet sleuths uncovered what they believe to be some startling new evidence - that implicates both Scott Tadych and Bobby Dassey in Teresa's murder.

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They believe that the two were responsible for raping, killing and burning the photographer's body, before dumping her car nearby and using Steven's burn pit to cremate her remains.

The Reddit user then claimed that Sgt. Andrew Colburn found Teresa's car while searching the Avery property - something he allegedly did not have jurisdiction to do.

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The theory 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.

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"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.

(Image: Netflix)

"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."

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.

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His nephew Brendan Dassey was later arrested after admitting to also playing a role in the murder. He is also serving a life sentence, although he will be eligible for parole in 2048, when he is 59-years-old.

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.

(Image: Netflix)

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

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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.