. >> reporter: kathy insisted we also speak to her psychologist sage breslin, ph.d, who largely attributeshy's actions and state of mind to excessive sleep deprivation, brought on in part by her round the clock care for her daughter. >> it isn't one of those things where you sleep for a couple of days and then you feel better. sleep deprivation makes a person get crazy. >> reporter: i think we can understand the mental pain you were in. you know? and i think we can understand the sleeplessness, as well. what's hard for us to understand is how thousands of families go through everything you were going through and they don't lash out at innocent people. >> i think people have more -- have resiliency by their support network, by their family, by their friends. i -- i didn't have those. >> she was playing russian roulette with my family, you know? there's no question in my mind she would get the right person at the right moment to come to the house and things would've happened. >> reporter: things happened all right. "catch," the high-tech law enforcement task force, connected the dots between