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To this day, he denies all the allegations. and those handcuffs and shackles, no evidence ever linked them to teresa. still, in the spring of 2007, juries convicted both dassey and avery of murdering teresa. they were each sentenced to life in prison. >> you are probably the most dangerous individual ever to set foot in this courtroom. >> it seemed like the avery saga had ended. but eight years later, "making a murderer" would put fassbender, kratz, and their entire team in the hot seat. coming up -- >> did they plant evidence? >> sure, they did. >> was steven avery framed? >> is it possible...

Convinced they had their man. still, they didn't know how or why theresa had been killed. coming up, shackle, handcuffs. strange behavior. >> theresa's creeped out. >> reporter: could something in his past have led him to murder? when "dateline" continues. ♪ protect your pet with the #1 name in flea and tick protection. frontline plus. trusted by vets for nearly 20 years.

Wrongful conviction cases and says she's freed 18 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 the correctional institute when she paid a visit to avery in 2016. >> million dollar question. do you think you have new evidence that could free steven avery? >> we do, yeah. >> zellner invited "dateline" into this war room she created in her office outside chicago. all dedicated to the avery case. >> do we know if that was tested? >> and she even showed us that rav4 she bought to get a bett...

He's never shared before. for one thing, kratz tells "dateline" he believes steven avery had set his sights on teresa halbach in the weeks leading up to her murder. >> as we move closer to october 31st, we see steven's behavior changing. >> as kratz got auto trader's record, he learned teresa had made five earlier visits to the salvage yard to take photos, some at steven avery's request. >> he starts making calls directly to teresa halbach. >> and kratz determined on the day before one of these visits, avery purchased these shackles and handcuffs. >> when teresa arrives -- >> he answers the do...

Head. >> but tom fassbender, the interrogator himself sees it all very differently. >> coming up -- >> this was seen by many as a false confession. >> i feel it was a real confession. he knew right from wrong. brendan was involved in this. >> when "dateline" continues. today... back pain can't win. now introducing aleve back and muscle pain. only aleve targets tough pain for up to 12 hours with just one pill. aleve back & muscle. all day strong. all day long. i'start at the new carfax.comar. show me minivans with no reported accidents. boom. love it. [struggles] show me the carfax. start your ...