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 suspect with a dark obsession. but the final twist in this case would leave the courtroom stunned. here's josh mankiewicz with "betrayal of trust." josh mankiewicz: california's south bay-- a singularly stunning strand of shoreline with familiar names like hermosa, redondo, and manhattan. we call it the sandbox. no one thinks that this part of los angeles exists. but it does. josh mankiewicz: this seaside playground is lined with beachfront properties worth millions. and nestled among these small beach towns is an oasis called el segundo. its main street usa. it's a great place to raise kids. josh mankiewicz: and in 2003, one of the rainmakers in the real estate business selling those beautiful homes in el segundo and the south ba