MANITOWOC, Wis. -

The lawyer for a Wisconsin man convicted in a case profiled in the "Making a Murderer" Netflix series says an agreement to start independent scientific testing on several critical pieces of evidence has been signed.

USA Today Network-Wisconsin reports the agreement was filed Wednesday with Angela Sutkiewicz, the special judge appointed to oversee Steven Avery's appeal. It comes nearly three months after Avery's lawyer, Kathleen 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.

Evidence to be tested includes a vial of blood said to be a sample of Avery's blood.

Zellner says it's encouraging the attorney general's office was "helpful in expediting these tests."