. >> tonight, federal murder charges have been filed against jared lofner for killing the aide. state charges are expected. the local sheriff says he is not cooperating and so the question now is why all this happened, as investigators start to peel away the layers of jared lofner's life, they are finding clues as to what may have driven this young man. >> on those first few moment was what happened here behind us. you saw him briefly in the setup piece with us tonight, the heroic young intern. how did you know to do what you did with such clarity and focus in the middle of what was going on here? >> one of the first things that i knew i needed to do was maintain my composure and maintain calm. not just for myself but for all of those around me, including the congresswoman. i had been trained as a certified nursing assistant and as as, so i learned basic first aid. >> in this case it was more than enough. you saw she had an entry gunshot wound, you applied pressure to the wound. you cradled her. i assume you tried to communicate with her. >> thankfully staying true to how she ha