NBC Nightly News Full Episode - Dec. 14

Tonight, late developments in two mass shootings, one here at home and one overseas, with images of a hero bystander captured on camera. At least 15 people killed when two attackers opened fire on a Hanukkah celebration at a world famous beach in Australia. Video, look at this, showing people running for cover.And the man who stepped in to take down one of the shooters, a child and a rabbi among the dead. Tonight, what we're learning about the father and son who officials say carried out the attack. The lat ...