>> i said, that's the woman that's going to get steven out of prison! >> zellner specializes in wrongful conviction cases and says she is freed many defendants, including ryan ferguson. sandy contacted her, and she joined the case not long after making a murderer came out. we caught up with zellner at a correction no correctional institution when she paid a visit to a bring in 2016. >> million dollar question, do you think you have new evidence that could free steven avery? >> we do, yes. >> zellner invited dateline into this war room she created in her office outside of chicago. all dedicated to the avery case. >> do we know if that was tested? >> and she even showed us this rav4 she bought to get a better understanding of teresa's vehicle. then, in august of 2016, too much media fanfare, she filed a motion in manitowoc county court seeking new testing of the evidence. >> we are going to find out one way or another was the evidence