Right now -- ONLY ON 4 -- we're hearing a killer's confession .... A Ponte Vedra Beach drifter describes how he murdered a woman who had taken him into her home. 00-07 You just heard Joseph Roberts say he, "picked up something and hit her." That "something" was a hammer. A jury never heard his confession. Now, we are hearing it for the first time. Brand new tonight, we also hear from a prosecutor who tells Channel 4 WHY Roberts was allowed to plead guilty to 2nd degree murder. In exchange for that plea .. he was sentenced to 30 years in prison. Channel 4's Tim Pulliam listened to more of this 2 hour interrogation video. 3 3 00-05 In a 2010 recorded interview with detectives, Joseph Roberts tells them he was arguing with his roommate Brittany Tavar, about an upcoming court case when he just snapped.51:13 and I came out just yelling at her, calling her an ungrateful báááá and I picked up something and I hit her. Roberts' told them he repeatedly beat Tavar with a hammer. He then explained to detectives where they could find her body - dumped in a wooded area in St. Johns County.14:47 Detective-is she buried or just tossed out there? Joe-she is semi-buried. I couldn't get the shovel in so, no not really. She is wrapped up in blankets and some trash bags.20:56 basically clean up all the blood, pour bleach everywhere and basically my goal was to buy time. I didn't think I would be getting away with anything, I just thought I was buying time.18:07 the main reason for not going immediately to the police was I didn't want to spend the rest of my life in jail.That was, that's why I ran. Because I was a coward. And I just, I didn't want to face it.In the middle of this bold confession, Roberts requested a lawyer.But detectives kept digging and he continued to share.46:24 I'll tell you this. I made a huge mistake. State Attorney R.J.Larizza, whose office prosecuted this case says in general that is one of the reasons to suppress a recorded confession from a jury. He says admissibility issues can range from Miranda rights not being read to the suspect to a request for a lawyer.Instead of going to trial, Roberts ple a d ed guilty accepting a 30 year sentence for 2nd degree murder R.J. Larizza/State Attorney, District 7 033632 There's always issues in cases; is the statement suppressible would you be able to admit it at trial is there other evidentiary issues.Just because somebody makes a statement doesn't mean that jury is going to wind up hearing it. 033646 in this case there were some questions about the statement itself. After discussions with the family and defense council it was determined that this would be an appropriate plea based on all of the circumstance.