>> all these pieces together made a big difference. >> reporter: all of it put together, said the prosecutors, told the story of how liz golyar murdered cari farver. they told the judge it happened the morning of november 13, 2012 after dave kroupa left for work. cari was on her laptop. >> we know by examination of cari farver's known facebook that she logged into her facebook at 6:39 a.m. that morning. about two minutes later she logged off. she was supposed to leave for work, but never made it. >> she was intercepted. something happened. that something was the defendant. >> reporter: hard to know exactly what liz did to cari, but -- it didn't take her too long because at 9:54 a.m. cari farver's cell phone is being used to access facebook. >> reporter: and at that moment