Avery’s lawyer, Kathleen Zellner, said an agreement to start independent scientific testing on critical pieces of evidence was signed, according to CBS News.
The agreement comes nearly three months after Zellner pledged she had a plan to overturn his 2007 conviction.
Avery was sentenced to life in prison after being convicted of first-degree intentional homicide in the 2005 death of photographer Teresa Halbach in Manitowoc County, Wisconsin.
Among the evidence to be tested, Avery’s blood sample will be included.
Zellner said she feels encouraged that the attorney general’s office was “helpful in expediting these tests.”
Earlier this month, a judge granted the release of Brendan Dassey, Avery’s nephew, who was convicted in 2007 of helping his uncle allegedly rape, kill and mutilate Halbach. He was a 16-year-old high school sophomore when he received a life sentence in prison. Dassey remains in prison after a federal appeals court blocked his release.
Dassey confessed to police but later recanted, while Avery has long stood by his innocence. Making a Murderer shed light on the crime they were both convicted of, but questioned, among other things, the testing of evidence linking Avery to Halbach’s murder.
Avery was previously convicted of rape and served 18 years in prison before being exonerated after DNA testing proved his innocence.