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the country, the case of susan powell. >> i was like, this can't be real. and he professed to love them. >> could it have been prevented? >> he exploded the house. >> as you listen to it now, what does it do to you? >> it's excruciating. >> the 9-1-1 dispatcher shares his story about that day. >> i wish i had recognized the urgency of the situation. >> also, the startling details of a plot unfolding. >> nobody knew what was going on. >> and a father's unraveling. >> he just saw that there was no way out. >> intimate emails from susan herself. the young mother's private fears in her o...

>> i did, yes. we started getting people following our page. >> where was she? what was behind this? far from home early. >> i saw the tattoo and i said, that's her tattoo, isn't it? >> and three caught on camera clues. someone's in her car. someone's at her back. but, most jaw-dropping of all, someone is up onstage with a song turned sinister. >> i couldn't believe what i was hearing and seeing. >> could karaoke be a key to this case? >> my heart was pounding and pounding. >> i was sweaty and nervous. we need to figure this out, fast. hello, and welcome to dateline. 29 year old carr...

And the debate over campus debates in a moment. But first, heres whats happening right now. Columbia university is trying to clear the encampment on its main lawn to prepare for graduation ceremonies. It gave students a 2 00 p. M. Deadline to leave or risk suspension. So far they have not left. With columbias president saying in a statement, one groups rights to express their views cannot come at the expense of another groups right to speak, teach and learn. Let us get right to the campus. Joining us now is nbc news correspondent guad venegas. No, its antonia hylton, im sorry about that. Also ...