'Making a Murderer': Steven Avery Pens Letter From Prison to Supporters

Making a Murderer Trailer (Official Trailer) Steven Avery Screen shot 2 - H 2016
Courtesy of Netflix

The Netflix series' focal point asks all tests that can be run, be run in his case.

Steven Avery has finally reached out to his supporters. 

In a handwritten letter posted on Twitter by his new attorney, Kathleen Zellner, on Friday, the main subject of the wildly popular Netflix documentary true crime series maintained his innocence and asked that every possible forensics test be run on the evidence in the case. 

"To my supporters: I want every forensics test possible because I am innocent," Avery wrote. 

Avery served 18 years in prison for a sexual assault conviction out of Manitowoc County, Wis., for which he was exonerated by DNA evidence in 2003. Then in 2005, Avery was convicted of the murder of 25-year-old Teresa Halbach. Avery's nephew, Brendan Dassey, was also convicted for the same murder. Dassey's lawyers argued his confession to authorities was coerced.

Avery's original trial lawyers argued Avery was framed by local law enforcement; the attorneys did not accuse law enforcement of killing Halbach, but said authorities believed so strongly that Avery was guilty, they planted evidence to ensure a conviction.

Zellner also discussed Avery and his case to some degree when she appeared on Dateline NBC on Friday. 

"Generally, since 2007, there have been significant advances in forensic testing," Zellner told Dateline's Andrea Canning. "Am I going to tell you exactly what it is? I am not. But it's been a long time. There was a lot of evidence that wasn't tested."

Avery filed an appeal in early January requesting his conviction be thrown out due to a tainted jury and evidence in the case that was mishandled by law enforcement.