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the country, the case of susan powell. >> i was like, this cant 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? >> its 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 fathers unraveling. >> he just saw that there...

>> 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, thats her tattoo, isnt it? >> and three caught on camera clues. someones in her car. someones at her back. but, most jaw-dropping of all, someone is up onstage with a song turned sinister. >> i couldnt 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 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. Joini...