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Not pleasant. Reporter young women murdered were missing. Families in anguish. I would text her and she would text back. Nothing. When they killed her, they killed me. Reporter a Serial Killer at work and maybe he had a friend. That is crazy. Serial killers are loaners. Everywhere. Reporter to suspected killers on the hunt. Hunting them. A detective devoted to justice and more. It is almost like he adopted these young women. A lot of visits to my Local Church saying, dont screw this up. Welcome to dateline. They were young women with their whole lives ahead them. Then One By one, they started ...

Trapp seemed stuck. >> i think she got a little frustrated and got a little desperate and came up with the idea of using the computer database. >> reporter: that is, the computer database of sex offenders. if they had a serial killer on their hands, there was at least a chance he'd already run afoul of the law at some point. it was a bit like just poking a finger into the haystack, frankly, and hoping to encounter a needle. but worth a try. so trapp called this woman. >> all sex offenders on parole, they will have an anklet, gps monitor. >> trap asked lomeli were any of those gps monitors here...

Weeks in, detective julissa trapp seemed stuck. >> i think she got a little frustrated, and got a little desperate, and came up with the idea of using the computer database. >> reporter: that is the computer database of sex offenders. if they had a serial killer on their hands, there was at least a chance he'd already run afoul of the law at some point. it was a bit like just poking a finger into the haystack frankly and hoping to encounter a needle. but worth a try. so trapp called this woman. sexual assault detective laura lomeli. >> all sex offenders on parole, they will have an anklet, a g...

Seemed stuck. >> i think she got a little frustrated and got a little desperate, and came up with the idea of using the computer database. >> reporter: that is the computer database of sex offenders. if they had a serial killer on their hands, there was at least a chance he'd already run afoul of the law at some point. it was a bit like just poking a finger into the haystack frankly and hoping to encounter a needle. but worth a try. so trapp called this woman. sexual assault detective laura lomeli. >> all sex offenders on parole, they will have an anklet, a gps monitor. >> reporter: trapp aske...

According to deputy d.a. larry yellin. >> should be a college girl and worried about grades and boys and football games and those things. >> reporter: one wrong turn and you never know? >> yeah. >> reporter: but almost three weeks in, detective julissa trapp seemed stuck. >> i think she got a little frustrated and got a little desperate and came up with the idea of using the computer database. >> reporter: that is the computer database of sex offenders. if they had a serial killer on their hands, there was at least a chance he'd already run afoul of the law at some point. it was a bit like jus...