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Entire griffith family. >> we were all frantic. we had no idea how it could have happened. >> when "dateline extra" continues.

The only person who could answer that was keith himself. >> he was very adamant about taking the stand. >> what would he say? and would the jury believe him. it was roll the dice time. coming up, keith's eyebrow-raising alibi. >> i was embarrassed and ashamed of what i was doing. >> and then what keith revealed to us. >> that's what i've told everybody, when they hear the story, they're not going to believe it. >> why even a jury couldn't end this case, when "dateline extra" continues. what is success? is it a professor who never stops being a student? is it a caregiver determined to take ca...

>> welcome to "dateline extra." i'm tamron hall. julie griffith was a loving wife and doting mother. when a blaze ripped through her home, it robbed her life and robbed her family of their matriarch. was this an accident? was it a robbery gone wrong, or was it something else entirely. here's dennis murphy with "consumed." >> the canterbury hill subdivision in paducah, kentucky, is a good place to raise kids. tidy homes kept up by neighbors living ordered lives. as the front porch lights went down on just another day, what happened one cold january night in the wee hours was especially alarming...

>> when "dateline extra" continues.

Of deanna james. >> ping, up comes a text message? >> that's correct. >> the message read, did you make it home okay? keith was quick to point out his relationship with deanna was completely platonic. >> she's more like a guy friend. >> no big deal? >> that's right. >> after that, keith was released to go and grieve with his family. detective carter, meanwhile, set out to verify keith's story. >> he had a receipt where he'd stayed. >> that puts him three hours away from this house fire. >> right. it showed his check-in time and check-out time. >> a quick check of keith's gun showed he was tell...