. >> today he walked out of joliet prison a free man. >> kathleen zeller's bio is filled with names fromry, who famously has been portrayed in "making a murderer." >> i have one goal, and that's to vacate the conviction of steven avery. >> part of zellner's great success comes from her ability to work with dna evidence. >> so, kevin fox was sure lucky when she took his case. >> kathleen goes and interviews kevin at the jail. >> he looked completely, totally in shock, like someone who'd seen a car crash. >> i met her at the jail. i said we needed her help because, obviously, i believed in kevin's innocence, 100%. >> kevin issues a statement that says there's no way that he did this, that he was coerced into a confession. >> kevin fox, in a written statement to the media, denies killing his 3-year-old daughter. he says, i tcoeratd answer the . yellingndmi at me that i killed her. >> was there ever a quiet dark moment where you thought, is my husband capable of this? >> absolutely not. no. i know kevin way too well. i watched him be a parent to our children every day. >> the family believes