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>> reporter: listen to it again. >> this is my son's friend. >> reporter: "this is my son's friend." one phrase in hours of material but it got dove's mind racing. if the bartender was right that the killers were friend of sandra's son, could that slip of paper hold the key to the case? dove tore through bags of evidence, and there it was. the day planner. seized five years earlier just after the murder. >> i went through that day planner for probably a day or more. went through every scratch, piece of paper, every notation, everything that was put into place in that day planner was looked at....

So with that new perspective on the case, dove revisited sandra's old interview. the hours of mostly useless chatter. >> how many times did you listen to that interview? >> at least ten times. >> reporter: and then it jumped out at him. right about here on the tape. sandra is going through slips of paper in her day planner. she looks at one and says -- >> this is my son's friend. >> reporter: listen to it again. >> this is my son's friend. >> reporter: "this is my son's friend." one phrase in hours of material but it got dove's mind racing. if the bartender was right that the killers were frie...

Sandra's old interview. the hours of mostly useless chatter. >> how many times did you listen to that interview? >> at least ten times. >> reporter: and then it jumped out at him. right about here on the tape, sandra is going through slips of paper in her day planner. she looks at one and says -- >> this is my son's friend. >> reporter: listen to it again. >> this is my son's friend. >> reporter: "this is my son's friend." one phrase in hours of material but it got dove's mind racing. if the bartender was right that the killers were friends of sandra's son, could that slip of paper hold the ke...

Dove tore through bags of evidence, and there it was. the day planner. seized five years earlier just after the murder. >> i went through that day planner for probably a day or more. went through every scratch, piece of paper, every notation, everything that was put into place in that day planner was looked at. there was a small piece of note paper with the name which appeared to me at that time to say schreiber with no telephone number or no significance to it. >> just said schreiber, that's all it said? >> i thought schreiber, yes. >> reporter: but where would he find this schreiber? doug we...

Looked at. there was a small piece of note paper with the name which appeared to me at that time to say schreiber with no telephone number or no significance to it. >> just said schreiber, that's all it said? >> i thought schreiber, yes. >> reporter: but where would he find this schreiber? doug went back to sandra's interview. when asked about detective wyatt about tom's friend, sandra said the boys were once work buddies. >> met him at target when they worked together. >> reporter: detective dove crisscrossed southern california, searching through the employment records of every target store ...