Top Story with Tom Llamas - Jan. 21 | NBC News NOW

The F.B.I reveals Brian Laundrie admitted to his killing Gabby Petito in a notebook found with his human remains, more than half the country is experiencing temperatures 20 degrees below normal with another round of snow on its way, a Pennsylvania teacher was photographed taping a mask over a student's face, and NBC News' Richard Engel joins the show giving rare access inside Ukraine's cyber defense agency where they are working around the clock to prevent online invasions.  » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews

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