"Making a Murderer's" Ken Kratz, the district attorney responsible for putting Steven Avery and his nephew Brendan Dassey behind bars in the Teresa Halbach case, is writing a tell-all book which he claims will prove that Avery killed Halbach, according to WBAY-TV.

Kratz said he's penning the book "because the one voice forgotten to this point is Teresa Halbach," the woman Avery and Dassey were found guilty of killing in 2005.

"I believe somebody needs to stand up for the cops, the courts, and the victim by telling the truth and setting forth the vast amount of evidence proving Avery's guilt beyond a shadow of a doubt," said Kratz, according to The Wrap.

The Netflix series follows the story of Avery, who spent 18 years in prison following a wrongful conviction on sexual assault charges and was convicted of murdering Halbach two years after his exoneration.

Halbach's remains were found on the property of Avery, who was also the last person she visited before her disappearance. Avery and his nephew were sentenced to life imprisonment for the crime.

The series has drawn worldwide attention since its premiere and sparked outrage against prosecution and Manitowoc County law enforcement officials over the treatment of Avery and the manner in which they handled the investigation of the Halbach case.

Avery's attorney, Kathleen Zellner, took to Twitter on Sunday to share a letter that Kratz sent Avery in September, last year asking her client to be "honest about what happened" and offering him the opportunity to work on a book together.

"Since I'm the only person who probably knows more about your case than anyone else, I hoped that you would choose me to tell your story to," the letter reads. "Unfortunately, you only want to continue your nonsense about being set up. That's too bad, because you had one opportunity to finally tell all the details, but now that will never happen."

Read the full letter below:

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