remember shane lamb, one of the stockboys along with rob render, mario ka sar ro and brian carrick. where did we find him? in jail on an unrelated charge. he sat down exclusively with 2020 with a stunning confession. >> i didn't have anything to do with this. he doesn't deserve to have in prison. >> it's safe to say he's serving 26 years in a maximum security prison because of your testimony. >> that's right. >> what you want to say about your testimony today in. >> all of it was false. every single thing, the state's attorney set it up. >> he's talking about assistant saying he forced him to place mario at the scene. shane says his back was against the wall. i was arrested for cocaine charges. my offer was 12 years. they said they would be indicted for murder if i didn't cooperate. >> here he is giving a statement but according to shane, what you don't see before this point, before the cameras roll, he makes allegations that combs sat him down for an hour without his lawyer telling him what to say point by point. >> on december 20th, 2002 mario karviar ro never called you to say co

eyewitnesses, no physical evidence tying mario to the crime scene or even a body, the investigation grew cold and so did the bond between the care ricks and the ka sar ros. >> the relationship had gone sour and then one day my dad say brian's mother had come in the store and she kind of turned her back to him when he approached that was the last time she ever spoke to him. >> but for mario, life was moving on. >> mario anthony. >> here he is receiving his degree in finance from illinois state university, three years after brian's disappearance. mario joined the family grocery, worked as a manager and helped build the business. >> that was not the only store that he was going to have. i was always going to be two stores and three stores and four stores. >> that grand plan would never happen. mario's world was about to collapse around him. a break in the case. this stockboy shane lamb would change everything with a tail of violence in the produce cooler the night brian vanished. >> i hit brian a few times, he was bleeding from his mouth. i thought i knocked him out. >> where is mario when you're doing this? >> right in the doorway. >> what did happen