prosecutors, mary claire flynn and katy rayburn, understood why.erybody, adults, teenagers, even parents with kids who don't even have phones yet. >> absolutely. i think it's good to be thinking about what you're putting out in the world. once you send it, you can't take it back. >> turn the gears. >> reporter: prosecutors believed michelle's words and actions caused a vulnerable conrad to kill himself. he described his fragile state in that video diary. >> racing thoughts. suicidal thoughts. flashbacks of hard times. >> reporter: and prosecutors learned michelle did more than send text messages to conrad. as deadly carbon monoxide filled the cab of his truck, michelle was talking to him on the phone. >> there were two phone calls after the last text message. one from him to her, 41 minutes. then one from her to him for over 42 minutes. >> reporter: but how would they ever know was said on those calls? detectives poured over thousands of text messages, and they got their answer. >> lo and behold on her phone, there was text messages to her friends