September 16, 2014 8:00 pm Park Police Officer Carl Hiott Recounts Shooting Navy Yard Gunman A year after the Navy Yard shooting, Park Police Officer Carl Hiott, who shot gunman Aaron Alexis, spoke to News4’s Mark Segraves about that day and the year since. Local 3:28 Social media and teens' mental health: A psychiatrist weighs in 1:41 DC-area police ramp up traffic enforcement in pedestrian safety campaign 3:05 ‘We need real liberation': George Washington University pro-Palestinian protest enters fifth day 2:17 GW asks to students to move pro-Palestinian demonstration 3:01 “It's 100% different”: Community reflects on emergency curfew at National Harbor