relationship with his wife >> we know from john, at least one incident he was engaged and intimate with stephanie lazarusngle and lazarus had deep feelings for john ruetten, maybe a motive to hurt sherri rasmussen >> reporter: scorned lover or coworker a few weeks later cops in northern california tracked down deborah and scooped up a sam of her trash which contained dna. it was sent to the crime lab in l.a. for hours later, came the . >> she was not the donor of the dna from the bite. >> reporter: left just one suspect, john ruetten's ex-girlfriend stephanie lazarus. nutall called the rasmussens. >> there was message from detective, they wanted to talk to us. i thought oh, yeah, right. thought it was another false hope >> reporter: this was detective nutall >> right. >> he said they were opening the investigation. >> upset with me, detective, where have you been the last two decades? >> reporter: now nils rasmussen explained it all, how he told detectives in 1986 someone was stalking his daughter sherri, a woman with crazy eyes, the ex-girlfriend of sherri's husband. nils had never known the name stepha