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>> it really threw him for a loop when he found out that my mom had met somebody else. >> police had a suspect and a case that was about to take an unbelievable turn. >> one of the most shocking things i have ever seen in a courtroom. >> hello and welcome to "dateline." deede keller had made a comfortable life for herself. a successful realtor in southern california, she lived in a charming neighborhood where she was surrounded by family and friends. then suddenly, deede disappeared. as her loved ones launched a frantic search, investigators would follow the trail of clues to a suspe...

>> or was it something more or someone else. >> it really threw him for a loop when he found out that my mom had met somebody else. >> police had a suspect and a case that was about to take an unbelievable turn. >> one of the most shocking things i have ever seen in a courtroom. >> hello and welcome to "dateline." deede keller had made a comfortable life for herself. a successful realtor in southern california, she lived in a charming neighborhood where she was surrounded by family and friends. then suddenly, deede disappeared. as her loved ones launched a frantic search, investigato...

Prosecutor's wildest dreams did he believe his opening statement would have the affect it did on erwin howard and his defense attorney andrew flyer. you hear that opening statement and something changes? >> something changed. after the opening statement i went back into lock-up and i spoke to erwin i said, hey, listen. remember how i was speaking about the circumstantial case and it could be powerful? i think there could be some problems now. and his answer was i need to tell you something. >> reporter: that something would stun dee dee keller's family and friends and the prosecutor, himself. ...

Defense was i wasn't there and i didn't have anything to do with it? >> correct. >> reporter: the defense attorney walked into the courtroom and made a statement that caused mouths to fall open. >> defense attorney gets up and he says that you're going to see something you'll never see in a court ever. he says my client killed dee dee keller but he didn't murder her. >> reporter: what did that mean? >> they trying to to see if they could get a manslaughter out of it. >> reporter: the d.a. asked to speak with erwin howard behind closed doors and made an offer. plead guilty to second-degree murd...