We learned new information today about the German pilot who deliberately crashed a plane into the French Alps last week, killing all 150 people on board. Investigators say Andreas Lubitz had researched information on how cockpit doors worked and looked into ways to carry out suicide. They called his actions "premeditated murder." And in all the news coverage, there is one key piece that keeps getting repeated over and over: severe depression. 

Lubiz did seek treatment from several doctors. But depression is a sensitive topic, and one a lot of people don’t fully understand, so we turned to two people who do. National Alliance on Mental Illness Medical Director Dr. Ken Duckworth and Harvard Medical School Associate Professor of Psychiatry Dr. Nancy Rappaport