Steven Avery, the subject of the Netflix documentary “Making a Murderer,” is continuing to maintain his innocence and penned a brief note to all his supporters. Avery’s attorney Kathleen Zellner shared the prisoner’s note through Twitter.

“To My Supporters,” Avery said in the note. “I want Every Forensic Test Possible Done B/c I am innocent.”

Avery is currently serving a life sentence in a Wisconsin prison for the 2005 murder of photographer Teresa Halbach. His nephew, Brendan Dassey, is also in prison on charges related to the same crime.

The Netflix docuseries has left many people convinced Avery and Dassey did not kill Halbach. And there have been allegations that police in Wisconsin who wrongly put Avery in prison for eight years in the Penny Beernsten sexual-assault case framed the now 53-year-old prisoner.

Ken Kratz, the former district attorney of Calumet County who prosecuted Avery during the Halbach trial, has repeatedly said Avery is guilty and accused the documentary makers of leaving out crucial evidence.

Filmmakers Moira Demos and Laura Ricciardi responded to Kratz’s comments this week by telling reporters at Netflix’s panel at a Television Critics Association event that they were not attempting to “convict or exonerate anyone.”

Instead, Ricciardi said (via Us Weekly):

“We set out to examine the criminal-justice system and how it’s functioning today. And it just would have been impossible for us to include every piece of evidence that was submitted to the court or attempted to be submitted to the court. And so we took our cues from the prosecution, what they thought was the most compelling evidence. That’s what we included. Of course, we left out evidence. I mean, there would have been no other way to do it. We were not putting on a trial, but a film.”