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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...

Sexually assaulted, viciously, according to deputy da larry yellin. >> should be a college girl and worried about grades and 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 desperate wand 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...

It was bad. >> reporter: strangled, beaten, sexually assaulted, viciously, according to deputy da larry yellin. >> should be a college girl and worried about grades and 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 desperate wand 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 t...