In December 2015, Netflix released a 10-part documentary series about a criminal case concerning the murder of Teresa Halbach. It followed the accused killer, Steven Avery, and later his nephew, Brendan Dassey, after the pair were arrested for the crime in 2007.

And within a few months of the show airing, millions of people were convinced of their innocence.

Making a Murderer has since gone on to achieve a world-renowned following, with people across the globe taking an interest in what exactly happened to Teresa Halbach - and how Steven Avery became the prime suspect in the case. Several petitions and appeals have been filed urging judges to reconsider evidence, internet forums have been set up to discuss possible missed clues or holes in people's stories, and everyone reading this right now is probably itching to share their opinion on whether or not Avery and his nephew are guilty of anything.

Now, three years after the first season aired, and more than a decade after the crime took place, Making a Murderer Part 2 is coming to Neftlix, and just the trailer alone has highlighted a massive hole in the original case.

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Since the documentary made waves in the media, Avery and Dassey's legal teams took on more help in order to overturn their convictions. Kathleen Zellner, a defence lawyer known for overturning wrongful convictions, and Tricia Bushnell, the legal director of the Midwest Innocence Project, have both joined the campaign to exonerate the two men - and their influence already seems promising.

In the teaser trailer for the new season, Zellner can be seen identifying a problem with one of the claims from the original case.

As you will remember, the prosecution always insisted that Teresa Halbach never left the Avery property (a "fact" that was important for securing his conviction), but there appears to be evidence from the contrary.

"The prosecution's case was Teresa never left the property, but the last call pings off a cellphone tower miles away from the Avery property," Zellner says.

You can take a look at the trailer yourself below:

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We don't know a great deal about what the new season will entail, but, according to Netflix, "This next chapter will provide an in-depth look at the high-stakes post-conviction process, as well as, the emotional toll the process takes on all involved."

Plus, according to Netflix's Ted Sarandos, "There is a ton of info that wasn't explored just in the confines of the episodes we've already done."

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Of course, we already know that Avery and Dassey are still in prison following their convictions, but that does not mean that the new series won't give us some of the answers we've been craving for the past few years.

Making a Murderer Part 2 premieres on October 19th on Netflix - so get ready to binge watch it all.

New 'Making a Murderer Part 2' trailer reveals a massive hole in the original case